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PubMed2005

Anidulafungin: a new echinocandin with a novel profile.

BACKGROUND: Until recently, available treatment for serious fungal infections comprised amphotericin B and azoles, which have limitations. Renal toxicity is a major concern with amphotericin B, while drug-drug interactions, hepatotoxicity, and skin rashes are the primary concerns with the azole medications. The development of the echinocandins, including caspofungin, has helped to fill the need for more efficacious antifungals that are useful across different patient populations and have a good safety profile. Anidulafungin is an echinocandin being developed to treat mucosal and invasive fungal infections. OBJECTIVE: The aim of this report was to describe the pharmacodynamic and pharmacokinetic (PK) properties of anidulafungin. METHODS: Data were identified using MEDLINE and National Library of Medicine Gateway searches for English-language literature (key words: anidulafungin, esophageal candidiasis, echinocandin, caspofungin, ravuconazole, voriconazole, posaconazole, micafungin, and fluconazole; years: 1996-2004), and from meeting abstracts of the American Society for Blood and Marrow Transplantation (Arlington Heights, Illinois), European Congress of Clinical Microbiology and Infectious Diseases (Basel, Switzerland), International Conference on Antimicrobial Agents and Chemotherapy (Washington, DC), and Infectious Diseases Society of America (Arlington, Virginia). RESULTS: Anidulafungin has potent in vitro activity against Aspergillus and Candida spp, including those resistant to either fluconazole or amphotericin B. Results of several clinical trials imply that anidulafungin is effective in treating esophageal candidiasis (EC), candidemia, and invasive candidiasis (IC). In a Phase III, randomized, blinded clinical trial evaluating anidulafungin (50 mg/d) versus fluconazole (100 mg/d) for the treatment of EC, 97.2% and 98.9% of patients who received anidulafungin and fluconazole, respectively, showed evidence of cure or improvement (treatment difference, -1.6%; 95% CI, -4.1 to 0.8). In a Phase II study of candidasis and candidemia, anidulafungin showed success rates of 72%, 85%, and 83% in patients receiving the drug at dosages of 50, 75, or 100 mg/d, respectively. Studies evaluating the concomitant use of anidulafungin and either amphotericin, voriconazole, or cyclosporine did not show clinically significant drug-drug interactions or altered adverse-event (AE) profiles (P < 0.05). A population PK analysis showed no significant effect of age, race, concomitant medications, or renal or hepatic insufficiency on the PK properties of anidulafungin (P < 0.05). CONCLUSIONS: Anidulafungin may offer a new option to treat serious fungal infections, such as EC, azole-refractory EC, candidemia, and IC. In addition, anidulafungin has been associated with no clinically significant drug-drug interactions and few treatment-related AEs. Anidulafungin may offer a new option in the management of serious and difficult-to-treat invasive fungal infections.

Anidulafungin↗
PubMed2005

Assessment of the safety and pharmacokinetics of anidulafungin when administered with cyclosporine.

Anidulafungin is a novel antifungal agent of the echinocandin class that is intended for the treatment of invasive fungal disease. It is likely that anidulafungin will be coadministered with cyclosporine. In vitro studies and clinical studies were performed to evaluate the effect of anidulafungin on cyclosporine metabolism and to investigate the safety and pharmacokinetics of anidulafungin when concomitantly administered with cyclosporine. The potential for anidulafungin to inhibit the metabolism of cyclosporine was evaluated by pooled human hepatic microsomal protein fractions in vitro, incubating 3H-cyclosporine with different concentrations of anidulafungin. The safety of coadministration and the effects of cyclosporine on the pharmacokinetics of anidulafungin were assessed in a multiple-dose, open-label clinical study of 12 healthy volunteers. Subjects received a 200-mg intravenous loading dose of anidulafungin, followed by a daily 100-mg intravenous maintenance dose on days 2 through 8. An oral solution of cyclosporine (Neoral oral solution; 100 mg/mL) 1.25 mg/kg was also administered to subjects twice daily on days 5 through 8. In the in vitro study, the addition of anidulafungin had no effect on cyclosporine metabolism by human hepatic microsomal protein fractions. In the clinical study, no dose-limiting toxicities or serious adverse events occurred. A small increase in anidulafungin concentrations and drug exposure (22%) was observed after 4 days of dosing with cyclosporine and was not considered to be clinically relevant. The results support the concomitant use of anidulafungin and cyclosporine without the need for dosage adjustments of either drug.

Administration, Oral↗
PubMed2004

Initial results from a longitudinal international surveillance programme for anidulafungin (2003).

OBJECTIVES: This longitudinal study evaluated the in vitro activity of anidulafungin against 880 clinical yeast isolates and 68 mould isolates from 64 medical centres in North America, Latin America and Europe. METHODS: MICs of anidulafungin, amphotericin B, 5-fluorocytosine, fluconazole, itraconazole, ketoconazole and voriconazole were determined using reference method (M27-A2) guidelines. The M38-A reference method was used for the filamentous fungi, including determination of minimum effective concentrations (MECs) of anidulafungin. RESULTS: Anidulafungin was more active when compared with fluconazole and itraconazole for Candida albicans (MIC(90), 0.06 mg/L), Candida tropicalis (MIC(90), 0.06 mg/L), Candida glabrata (MIC(90), 0.12 mg/L), Candida krusei (MIC(90), 0.06 mg/L) and Candida lusitaniae (MIC(90), 1 mg/L) as well as the less-often encountered yeast species. Anidulafungin was less active against Candida parapsilosis, Candida guilliermondii and Candida famata (MIC(50), 1-2 mg/L). Anidulafungin also exhibited excellent activity against all Aspergillus spp. (MEC(90), < or =0.03 mg/L). Anidulafungin was also evaluated comparing two end point reading criteria and two incubation intervals. Data indicate that longer incubation periods do not significantly influence overall MIC ranges. These international surveillance results for anidulafungin confirm the activity observed in studies of smaller numbers of isolates.

Anidulafungin↗
PubMed2006

Anidulafungin pharmacokinetics and microbial response in neutropenic mice with disseminated candidiasis.

Candidemia is often fatal, especially in patients with persistent neutropenia. New therapies are needed. We performed 24-h pharmacodynamic studies to compare the efficacies of anidulafungin, fluconazole, and amphotericin B in neutropenic mice with disseminated candidiasis caused by one of three strains of Candida glabrata. Anidulafungin produced a maximal fungal kill (E(max)) of 1.4 to 1.9 log(10) CFU/g in kidneys and was not influenced by resistance to either fluconazole or amphotericin B. Fluconazole produced an E(max) of 1.3 log(10) CFU/g in mice infected with fluconazole-susceptible C. glabrata, but the E(max) was 0 for mice infected with a C. glabrata strain that had a fluconazole MIC of >/=32 mg/liter. Amphotericin B achieved an E(max) of 4.2 log(10) CFU/g in mice infected with amphotericin B-susceptible C. glabrata, but the E(max) was 0 for mice infected with a C. glabrata strain with an amphotericin B MIC of 2 mg/liter. In all instances, anidulafungin's maximal microbial kill was superior to that of fluconazole. Next, we performed a 96-h anidulafungin pharmacokinetic-pharmacodynamic study. Anidulafungin exhibited delayed peak concentrations in kidneys compared to those in serum, after which the concentrations declined, with a serum terminal half-life of 21.6 (+/-4.6) h. This was accompanied by a persistent 96-h decrease in the kidney fungal burden after treatment with a single anidulafungin dose of >/=8 mg/kg of body weight. This pharmacokinetic-pharmacodynamic picture of anidulafungin persistence in tissues and the resultant persistent fungal decline should be exploited to improve the efficacy of anidulafungin therapy for candidemia.

Algorithms↗
PubMed2006

Anidulafungin: a novel echinocandin.

Until recently, the treatment available for serious fungal infections was composed of amphotericin B and azoles, and each class demonstrated significant limitations. Echinocandins are a new class of drugs that have shown promising results in treating a variety of fungal infections. Of these, anidulafungin is a novel echinocandin that appears to have several advantages over existing antifungals. It is unique because it slowly degrades in humans, undergoing a process of biotransformation rather than being metabolized. It has potent in vitro activity against Aspergillus and Candida species, including those resistant to fluconazole or amphotericin B. Results of several clinical trials indicate that anidulafungin is effective in treating esophageal candidiasis, including azole-refractory disease. The results of a recent study comparing fluconazole versus anidulafungin demonstrated the superiority of anidulafungin in the treatment of candidemia and invasive candidiasis (IC). Studies evaluating the concomitant use of anidulafungin and either amphotericin B, voriconazole, or cyclosporine did not demonstrate significant drug-drug interactions or adverse events. To date, anidulafungin appears to have an excellent safety profile. On the basis of early clinical experience, it appears that anidulafungin will be a valuable asset in the management of serious and difficult-to-treat fungal infections.

Anidulafungin↗
PubMed2004

Population pharmacokinetic analysis of anidulafungin, an echinocandin antifungal.

The objective of this analysis was to describe the pharmacokinetic characteristics of anidulafungin in patients with serious fungal disease based on pharmacokinetic data collected during four recently completed or ongoing Phase II/III clinical studies. A total of 600 anidulafungin plasma samples from 225 patients across the four studies were available for analysis. Patients received daily intravenous infusions of 50, 75, or 100 mg anidulafungin, preceded by a loading dose that was twice the daily dose. The analysis population consisted of 129 patients with esophageal candidiasis, 87 with invasive candidiasis, 7 with invasive aspergillosis, and 2 with azole refractory mucosal candidiasis. A population analysis approach was used to develop a steady-state pharmacokinetic model for anidulafungin, assess the significance of possible covariates, and determine the amount of intersubject and random residual variability. A two-compartment model with first-order elimination provided the best fit to the data. The clearance of anidulafungin was influenced by weight and gender, and subjects in the invasive candidiasis study had a typical clearance that was approximately 30% higher than subjects from other studies. Weight was determined to be a predictor of the central volume of distribution. The covariates on clearance accounted for less than 20% of the intersubject variability and therefore are deemed to be of little clinical relevance. There was no evidence that the presence of rifampin or metabolic substrates, inhibitors, or inducers of cytochrome p450 influenced the clearance of anidulafungin. This indicates that dosing adjustments are not necessary when anidulafungin is administered in the presence of medications falling into these classifications.

Adolescent↗
PubMed2004

Anidulafungin: an echinocandin antifungal.

Anidulafungin (LY-303366, V-echinocandin trade mark, Vicuron Pharmaceuticals, Inc.) is a new echinocandin antifungal agent with broad spectrum activity against Candida and Aspergillus spp. Anidulafungin exhibits low toxicity, concentration-dependent fungicidal activity for Candida, and a prolonged post antifungal effect (> 12h). In vitro activity demonstrates excellent potency and spectrum versus azole-susceptible and -resistant Candida spp. and a low minimum effective concentration for Aspergillus spp. In vivo anidulafungin is fungicidal against Candida in neutropenic animal models of disseminated candidiasis. Against Candida anidulafungin exhibits concentration-dependent killing and clearance of residual fungal burden in target organs (liver, lung, spleen, kidney) and plasma/tissue concentrations exceed the minimum inhibitory and minimum fungicidal concentrations of the infecting organism throughout the dosing interval. Although the activity of anidulafungin in animal models of pulmonary or disseminated aspergillosis shows increased survival and improvement in the pulmonary infarct score, the effect on residual fungal burden and Aspergillus antigenemia determination does not indicate in vivo fungicidal activity. It seems that the major effect of anidulafungin and other echinocandins in vivo against Aspergillus spp. is the decrease in the angioinvasive potential of the organisms. Clinically, anidulafungin has been shown to be safe and effective in the treatment of oesophageal candidiasis and candidemia. Further clinical application of this new antifungal agent is warranted.

Anidulafungin↗
PubMed2003

Anidulafungin: ECB, LY 303366, V-echinocandin, VEC, VER 002, VER-02.

Vicuron Pharmaceuticals (formerly Versicor Inc.) is developing anidulafungin [LY 303366, ECB, V-echinocandin, VEC, VER-02, VER 002], a lipopeptide echinocandin B derivative, for IV treatment of mycoses. Anidulafungin acts against fungal infection by inhibiting beta-1,3-glucan synthase, an enzyme essential for cell wall formation. Anidulafungin was originally developed for oral use by Eli Lilly and was undergoing phase II clinical trials in the UK and the US for the treatment of Candida, Aspergillus and Pneumocystis carinii infections. However, Eli Lilly discontinued development of the oral formulation due to poor oral bioavailability. In May 1999, Versicor obtained exclusive worldwide commercialisation rights to anidulafungin with responsibility for its development and clinical registration. Under the terms of the agreement, Eli Lilly received a signing fee, and will receive milestone payments upon future development of anidulafungin and royalties on future sales. Eli Lilly also retains an option for the development of an oral formulation of the compound. On 3 March 2003, Versicor Inc. of Fremont (California, USA) and Biosearch Italia SpA of Milan (Italy) announced the completion of a merger agreement, whereby Biosearch was merged with and into Versicor in a stock-for-stock exchange valued at US dollars 260.7 million. The combined company temporarily kept the name Versicor until the new name, Vicuron Pharmaceuticals, was announced on 26 March 2003. In January 2003, Versicor announced that positive results from a phase II trial for anidulafungin IV treatment involving 120 patients in the US with invasive candidiasis/candidaemia, have led to another double-blind, randomised phase III trial being conducted in the US, Canada and Europe for this indication. This additional phase III trial will enrol approximately 300 patients to investigate the efficacy of IV anidulafungin (200 mg loading dose followed by 100 mg maintenance dose) versus IV fluconazole for 10 to 42 days. Vicuron Pharmaceuticals also plans to seek approval for invasive candidiasis/candidaemia in Europe and Canada in the second half of 2003.

Anidulafungin↗
PubMed2004

A randomized, double-blind trial of anidulafungin versus fluconazole for the treatment of esophageal candidiasis.

Anidulafungin is a novel antifungal agent of the echinocandin class. This randomized, double-blind, double-dummy study compared the efficacy and safety of intravenous anidulafungin to that of oral fluconazole in 601 patients with endoscopically and microbiologically documented esophageal candidiasis. Patients received intravenous anidulafungin (100 mg on day 1, followed by 50 mg per day) or oral fluconazole (200 mg on day 1, followed by 100 mg per day) for 7 days beyond resolution of symptoms (range, 14-21 days). At the end of therapy, the rate of endoscopic success for anidulafungin (242 [97.2%] of 249 treated patients) was found to be statistically noninferior to that for fluconazole (252 [98.8%] of 255 treated patients; treatment difference, -1.6%; 95% confidence interval, -4.1 to 0.8). The safety profile of anidulafungin was similar to that of fluconazole; treatment-related adverse events occurred in 9.3% and 12.0% of patients, respectively. Laboratory parameters were similar between treatment arms. Anidulafungin is as safe and effective as oral fluconazole for the treatment of esophageal candidiasis, when assessed at the completion of therapy.

Administration, Oral↗
PubMed2006

In vitro interactions of anidulafungin with azole antifungals, amphotericin B and 5-fluorocytosine against Candida species.

Anidulafungin, an echinocandin, is in late stage development for the treatment of fungal infections. We investigated the activity of anidulafungin in combination with other antifungal agents (fluconazole, itraconazole, ketoconazole, amphotericin B and 5-fluorocytosine) against four isolates each of Candida albicans, Candida glabrata, Candida parapsilosis and Candida tropicalis, and two isolates of Candida krusei using a macrobroth chequerboard method with interactions evaluated by fractional inhibitory concentration indices (FICIs). Additive activity (FICI > 0.5 to 1) or indifference (FICI > 1 to < 4) was observed in 85 of 90 interactions of anidulafungin with another antifungal agent. Synergy with itraconazole (FICI or=4), a drug rarely used systemically, was noted for four strains of C. tropicalis. The combination of anidulafungin and amphotericin B demonstrated additive activity for each of the 18 isolates of Candida tested. These results suggest additional studies are warranted, for example in animal models, to evaluate further the potential of combination antifungal therapy with anidulafungin for Candida infections.

Amphotericin B↗
PubMed2002

Antifungal activities of fluconazole, caspofungin (MK0991), and anidulafungin (LY 303366) alone and in combination against Candida spp. and Crytococcus neoformans via time-kill methods.

The activities of the echinocandins caspofungin and anidulafungin were evaluated alone and in combination with fluconazole using time-kill methods against isolates of Candida albicans, Candida glabrata, Candida tropicalis, Candida krusei, and Cryptococcus neoformans. Antifungal concentrations tested against each isolate were 0.5 microg/mL and 20 microg/mL of fluconazole and 0.007 microg/mL and 2 microg/mL of both caspofungin and anidulafungin. In addition, 20 microg/mL of fluconazole was tested with 2 microg/mL of caspofungin and anidulafungin to test for additive or antagonistic activity. Finally 0.5 microg/mL of fluconazole was tested with 0.007 microg/mL of caspofungin and anidulafungin to test for synergy. Combinations of fluconazole and caspofungin or anidulafungin resulted in indifference. Azole-echinocandin combinations do not produce antagonistic effects; therefore, combinations of these agents may warrant future clinical evaluation.

Anidulafungin↗
PubMed2003

Antifungal activity of the echinocandin anidulafungin (VER002, LY-303366) against yeast pathogens: a comparative study with M27-A microdilution method.

This study further evaluated the in vitro activity of anidulafungin (VER002, Versicor Inc.) (LY303366) against 460 clinical yeast isolates. MICs of anidulafungin, fluconazole and itraconazole were determined by following the NCCLS M27-A guidelines. Minimum fungicidal concentrations (MFCs) of anidulafungin were determined for 230 isolates of Candida spp. The activity of anidulafungin in vitro was significantly superior (P < 0.05) to those of itraconazole and fluconazole against Candida albicans, Candida tropicalis, Candida glabrata and Candida krusei, but anidulafungin was less active for Candida famata and Candida parapsilosis. The differences were not significant for the other species evaluated.

Anidulafungin↗
PubMed2006

Safety and pharmacokinetics of intravenous anidulafungin in children with neutropenia at high risk for invasive fungal infections.

Anidulafungin is an echinocandin with activity against Candida species and Aspergillus species. Adult dosages under study are 50 mg/day for esophageal candidiasis and 100 mg/day for invasive candidiasis and aspergillosis. Little is known, however, about the safety and pharmacokinetics of anidulafungin in children. A multicenter, ascending-dosage study of neutropenic pediatric patients was therefore conducted. Patients were divided into two age cohorts (2 to 11 years and 12 to 17 years) and were enrolled into sequential groups to receive 0.75 or 1.5 mg/kg of body weight/day. Blood samples were obtained following the first and fifth doses. Anidulafungin was assayed in plasma, and pharmacokinetic parameters were determined. Safety was assessed using National Cancer Institute (NCI) common toxicity criteria. Pharmacokinetic parameters were determined for 12 patients at each dosage (0.75 mg/kg/day or 1.5 mg/kg/day). Concentrations and drug exposures were similar for patients between age cohorts, and weight-adjusted clearance was consistent across age. No drug-related serious adverse events were observed. One patient had fever (NCI toxicity grade of 3), and one patient had facial erythema, which resolved with slowing the infusion rate. Anidulafungin in pediatric patients was well tolerated and can be dosed based on body weight. Pediatric patients receiving 0.75 mg/kg/day or 1.5 mg/kg/day have anidulafungin concentration profiles similar to those of adult patients receiving 50 or 100 mg/day, respectively.

Adolescent↗
PubMed2005

In vitro activities of anidulafungin against more than 2,500 clinical isolates of Candida spp., including 315 isolates resistant to fluconazole.

Anidulafungin is an echinocandin antifungal agent with potent activity against Candida spp. We assessed the in vitro activity of anidulafungin against 2,235 clinical isolates of Candida spp. using the CLSI broth microdilution method. Anidulafungin was very active against Candida spp. (the MIC at which 90% of strains are inhibited [MIC(90)] was 2 microg/ml when MIC endpoint criteria of partial inhibition [MIC-2] were used). Candida albicans, C. glabrata, C. tropicalis, C. krusei, and C. kefyr were the most susceptible species of Candida (MIC(90), 0.06 to 0.12 microg/ml), and C. parapsilosis, C. lusitaniae, and C. guilliermondii were the least susceptible (MIC(90), 0.5 to 2 microg/ml). In addition, 315 fluconazole-resistant isolates were tested, and 99% were inhibited by < or =1 microg/ml of anidulafungin. These results provide further evidence for the spectrum and potency of anidulafungin activity against a large and geographically diverse collection of clinically important isolates of Candida spp.

Anidulafungin↗
PubMed2005

Safety and pharmacokinetics of coadministered voriconazole and anidulafungin.

There is considerable interest in combining echinocandin and triazole antifungal agents for treatment of invasive fungal infections; however, information is needed regarding the tolerability and potential for pharmacokinetic interactions. Anidulafungin is a semisynthetic echinocandin, and voriconazole is an extended-spectrum triazole. In a random sequence, 17 subjects received anidulafungin with placebo, voriconazole with placebo, and anidulafungin with voriconazole. Anidulafungin was administered intravenously: 200 mg on day 1, then 100 mg/d on days 2 through 4. Voriconazole was administered orally: 400 mg every 12 hours on day 1, then 200 mg every 12 hours on days 2 to 4. No dose-limiting toxicities or serious adverse events occurred, and all adverse events were mild and consistent with the known safety profiles of both drugs. Pharmacokinetic parameters were not affected by coadministration. The geometric mean ratio (90% confidence interval) of the combination/drug alone for AUC(SS) was 97.4% (94.9-99.9), 97.4% (92.1-103.0), and 94.4% (87.0-102.5) for anidulafungin, voriconazole, and the voriconazole metabolite, respectively.

Adult↗
PubMed2003

In vitro activity of voriconazole, itraconazole, caspofungin, anidulafungin (VER002, LY303366) and amphotericin B against aspergillus spp.

Voriconazole, anidulafungin (VER002, LY303366) and caspofungin are promising antifungal agents which provide a good protection against a variety of fungi, including yeasts and filamentous fungi. In this study, we tested the in vitro efficacy of voriconazole, itraconazole, caspofungin, anidulafungin (VER002, LY303366) and amphotericin B, against different species of Aspergillus spp. isolated from clinical specimens, using a microdilution broth method and following the NCCLS guidelines (document M38-P). We also evaluated the effect that time readings have on MIC results. For caspofungin, we determined the minimun effective concentration (MEC), defined like the lowest concentration of caspofungin causing abnormal hyphal growth. Anidulafungin (VER002, LY303366) was the most active antifungal agent tested with MIC(90) of < or =0,03 mg/L. The activity of voriconazole, and itraconazole very similar with MIC(90) of 0,12 mg/L, 0,12 mg/L respectively. For caspofungin the MEC(90) was of 0,25 mg/L. Amphotericin B was the lest active antifungal agent studied with MIC(90) of 1 mg/L. There were no differences between MIC values at 48 and 72 h. These data demonstrate promising activity of voriconazole, anidulafungin (VER002, LY303366) and caspofungin against Apergillus spp.

Amphotericin B↗
PubMed2006

The safety of anidulafungin.

The echinocandins are a new class of antifungal that have shown promising results in treating a variety of fungal infections. Anidulafungin is the newest approved echinocandin and may have some advantages over existing antifungals. It has activity against a broad range of fungi. It is unique because it undergoes a process of slow chemical degradation rather than being metabolised. Studies evaluating the use of anidulafungin in combination with other commonly used drugs have not demonstrated any significant drug-drug interactions or adverse events. Thus far, anidulafungin appears to have an excellent safety profile with few adverse events. Based on early clinical experience, it appears that anidulafungin will be a valuable and safe asset in the management of serious and difficult-to-treat fungal infections.

Anidulafungin↗
PubMed2004

Anidulafungin.

Anidulafungin is a novel antifungal agent which, like other echinocandins, inhibits beta-(1,3)-D-glucan synthase and disrupts fungal cell-wall synthesis. It has marked antifungal activity against a broad spectrum of Candida spp. and Aspergillus spp., including amphotericin B- and triazole-resistant strains. In clinical trials, anidulafungin has primarily been evaluated in patients with oesophageal and invasive candidiasis. Preliminary data are emerging for other indications such as invasive aspergillosis. In a large, multicentre, double-blind, double-dummy, randomised trial in patients with oesophageal candidiasis, intravenous anidulafungin 50 mg/day was as effective as oral fluconazole 100 mg/day regarding end-of-treatment rates of endoscopic cure and clinical and microbiological success. Duration of treatment was approximately 2-3 weeks, and patients in both groups received a loading dose of study drug (twice the daily maintenance dose) on day 1. Anidulafungin is generally well tolerated. Across the dosage range 50-100 mg/day, adverse events appear not to be dose- or infusion-related. In the largest clinical trial to date, the most common treatment-related adverse events were phlebitis/thrombophlebitis, headache, nausea, vomiting and pyrexia.

Anidulafungin↗