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Non-competitive anti-oestrogenic activity of progesterone antagonists in primate models.

We have summarized some of the studies containing basic biological data suggesting potential therapeutic utility of the anti-proliferative activity of antiprogestins on uterine tissues. The non-competitive anti-oestrogenic effects of RU486 were examined using oestradiol-treated ovariectomized monkeys given RU486, progesterone or both. The oestradiol-induced luteinizing hormone surge of control animals was abrogated by progesterone and/or RU486. Secretory transformation by progesterone was inhibited by RU486 co-administration. RU486 alone (1 mg/kg) induced endometrial secretory transformation, but higher doses (5 mg/kg) induced inhibited proliferation and secretory activity. Thus, in the presence of progesterone, RU486 is antagonistic but, in its absence, RU486 exhibits endometrial progestational effects at low doses and an anti-proliferative (anti-oestrogenic) effect at higher doses. These data encourage continued evaluation of RU486 as a potential contraceptive agent acting at the pituitary and/or endometrial level. Our study also demonstrates that after physiological oestradiol replacement therapy, oestradiol receptor concentrations rise dramatically following antiprogestin treatment; this effect was dose-dependent.

Animals↗

Drug interactions in dental practice: a summary of facts and controversies.

The potential for drug interactions is a concern to all dentists. The issue is made even more imposing by the amount of scientific information published each month. It is not only important for dentists to be aware of interactions that have been established, but also those that are no longer tenable. Of particular concern are continued misconceptions about the antibiotic-oral contraceptive and the vasopressor-antidepressant interactions. This article will clarify these issues as well as highlight established interactions associated with those drug classes used most frequently in dental practices.

Adrenergic beta-Antagonists↗

[Contraception for the man].

Current possibilities of contraception that can be practiced by the male continue to be based on the barrier concept. Methods that have an action on the spermatozoa, whether toxic, immunologic or hormonal have not become established in Germany, although the latter is still being researched, and even practiced (gestagen implant), in some countries. The two barrier methods--the condom and vasectomy--both have a permanent place in contraception: the condom is by far the more popular of the two, additionally providing protection against infection and free of side effects. The invasive procedure of vasectomy is not widely practiced, although, on the basis of risk-benefit considerations, it is the method of choice vis-à-vis the pill when a couple definitively want no more children.

Contraceptive Agents, Male↗

Requests for emergency contraception at an accident and emergency department--assessing the impact of a change in legislation.

The aim of this study was to examine the pattern of attendance of patients requesting Emergency Hormonal Contraception (EHC) at an accident and emergency department before and after a government driven change in legislation, which allowed EHC to be sold over-the-counter by trained pharmacists, to women aged 16 years and above. We employed retrospective comparative study using computer records of all accident and emergency attendances coded as requests for emergency contraception for the years 2000 and 2001. The number of patients requesting emergency contraception at the A&E department decreased after over-the-counter sales were introduced, from 196 in the year 2000 to 164 in 2001 (p = 0.037). Despite this, the number of teenagers requesting emergency contraception at the A&E department increased in 2001--from 63 in 2000 to 74 in 2001 (p = 0.0115). Most requests are received outside local pharmacy opening hours--63.77% in 2000 and 62.2% in 2001. This study raises concerns that the government initiative allowing emergency hormonal contraception to be sold in pharmacies is having little impact on teenagers most in need of this service. A&E departments can expect to continue to receive a significant number of requests for emergency contraception. Further measures will be required to reduce the U.K.'s high rate of unplanned pregnancies.

Adolescent↗

Pregnancy prevention in adolescents.

Although the pregnancy rate in adolescents has declined steadily in the past 10 years, it remains a major public health problem with lasting repercussions for the teenage mothers, their infants and families, and society as a whole. Successful strategies to prevent adolescent pregnancy include community programs to improve social development, responsible sexual behavior education, and improved contraceptive counseling and delivery. Many of these strategies are implemented at the family and community level. The family physician plays a key role by engaging adolescent patients in confidential, open, and nonthreatening discussions of reproductive health, responsible sexual behavior (including condom use to prevent sexually transmitted diseases), and contraceptive use (including the use of emergency contraception). This dialogue should begin before initial sexual activity and continue throughout the adolescent years.

Adolescent↗

Oral contraceptives: current status.

During the past four decades, oral contraceptives have remained a safe and effective method of birth control. Reductions in the estrogen and progestin dosages have significantly decreased the incidence of cardiovascular complications. The association between oral contraceptives and breast cancer appears to be primarily because of detection bias or possibly a promotional effect. Despite the changes in formulation, the problems related to side effects have not been totally solved. Because compliance and successful use is strongly affected by side effects, improvement in this area is probably the biggest challenge faced by developers of oral contraceptives. It is also clear that there are a growing number of significant noncontraceptive benefits that accrue in oral contraceptive users. Unfortunately, many women do not know about these benefits. Thus, one of the issues that providers need to continue to address is how to provide better information about oral contraceptives and contraception in general to patients.

Acne Vulgaris↗

A survey of teenage pregnant women and their male partners in the Grampian region.

This paper describes an exploratory pilot study of the male partners of teenagers presenting for either termination of pregnancy (TOP) or antenatal care (ANC). Seventy-five teenage pregnant women were recruited into the study and were asked to complete a questionnaire. The results suggest that the male partners tended to be older than their teenage partners. Teenage pregnant women presenting for termination of pregnancy had statistically significant higher levels of education, compared to those presenting for antenatal care. An association was found between the women's decision to continue or not with the pregnancy and her chosen form of contraception. In the antenatal group, women tended to state that their male partner's indication of support had influenced their decision to continue with the pregnancy. In-depth research should be conducted on the male partners of teenage pregnant women if effective sex education interventions are to be developed.

Abortion Applicants↗

Indicators for measuring the quality of family planning services in Nigeria.

This article presents the Situation Analysis approach as a means of collecting data that can be used to assess the quality of care provided by family planning service-delivery points (SDPs), and describes the quality of services offered in Nigeria. Elements of the quality of services provided at 181 clinical service-delivery points in six states of Nigeria are described. The substantive results from the study suggest that although most of the 181 service points sampled are functional, the quality of care being provided could be improved. Illustrative scores for these indicators and elements of the Bruce-Jain framework are given. By comparison with contraceptive prevalence surveys, the Situation Analysis approach is still in its early stages. Some methodological issues are raised here and future directions for strengthening the validity and applicability of the approach are discussed.

Bias↗

The use of nonhormonal methods of contraception in adolescents.

Although the 1990s have seen a reduction in unintended pregnancy rates and improved contraceptive-use rates, the negative consequences of unintended pregnancy and STD acquisition continue to plague our youth. Primary health care providers, including pediatricians, play an essential role in further reducing unintended teen pregnancy and STD acquisition rates through the promotion of effective and consistent contraception. Pediatricians need to be aware that now, more than ever, nonhormonal contraceptive methods should be used by every sexually active youth, and counseling of both boys and girls should be routine. Although not as effective at preventing pregnancy as hormonal methods of contraception, many nonhormonal methods provide excellent STD protection. Condoms plus spermicide continue to be a very popular and effective method of pregnancy and STD prevention. The newer polyurethane male and female condoms provide alternative, safe barrier protection, although their efficacy at preventing HIV in vivo needs further study. Diaphragms and cervical caps, in conjunction with spermicide, also provide pregnancy and STD prevention, but not as effectively as male condoms plus spermicide. Although most likely to use condoms in association with another birth control method, adolescents often find dual-method use cumbersome and difficult to comply with. Finally, although IUDs and periodic abstinence are safe methods of birth control for older women in monogamous relationships, they are unlikely to be appropriate for most adolescents. In many respects, we have come full circle back to our "nonhormonal contraceptive roots." As we enter the twenty-first century, we have found that no single "miracle" approach can be used to reduce adolescent pregnancy and STD rates. Rather, pediatricians are obliged to offer nonhormonal methods of contraception, often in conjunction with other birth control methods, as a means of preventing unwanted STDs and pregnancy. Through a comprehensive community approach that uses sex education, abstinence programs, condom-availability programs, and contraceptive-skills training, however, pediatricians can play a central role in the promotion of effective and consistent contraception by adolescents.

Adolescent↗

Female condoms.

Early versions of a female condom were available in the 1920s and 1960s, but they were little used and soon forgotten. It took the arrival of AIDS, and the urgent need for a wider range of female-controlled barrier techniques, to rekindle scientific interest in this method. In the 1980s, three groups in Europe and the USA began development of new female condom designs, comprising 'Femidom (Reality)', the 'Bikini Condom', and 'Women's Choice'. Apart from differences in their physical design, Femidom differs from the others in that it is made of a polyurethane membrane, which has several advantages over latex. Of the three, Femidom is the most advanced in terms of development and clinical testing, and it is the only one to have reached the marketing stage. Laboratory studies and clinical trials suggest that its contraceptive efficacy is similar to that documented for the male condom, though a direct comparison is not possible because no comparative clinical trials have, as yet, been undertaken. Reported 'typical-use' pregnancy rates range from 12.4 to 22.2% at 6 months of use in the USA and Latin America, respectively, while a study in the UK observed a rate of 15% at 12 months. As with all barrier methods, most failures appear to be associated with poor compliance or incorrect use. 'Perfect-use' pregnancy rates were substantially lower, indicating that Femidom can be very effective, if used consistently and correctly. Evidence for Femidom's effectiveness to protect against transmission of sexual disease-causing organisms, including HIV, is still very limited and based largely on laboratory studies. Whilst, in theory, the condom should confer reliable protection, its efficacy in clinical use will depend upon correct and consistent use and upon the product's ability to maintain an effective physical barrier throughout penetrative intercourse. In this respect, the results of recent and ongoing clinical studies are expected with much interest. How valuable Femidom will prove to be, in terms of sexual health and contraception, will also depend largely on its long-term user-acceptability. As is generally the case with new methods, initial public interest in Femidom is expected to be high, as was documented in numerous surveys, and there undoubtedly exists a sub-group of women who view the product as their most appropriate contraceptive/sexually transmitted disease prevention option. However, more information on the product's acceptability, based on continuation rates, as is usually applied to other contraceptive techniques, is urgently needed to permit a more reliable assessment of Femidom's position among current methods. The arrival of a female condom represents a welcome addition to the range of female-controlled barrier contraceptives and, because of its numerous potential advantages over the male condom, may play an important role in the prevention of unwanted pregnancy and sexually transmitted diseases.

Single-Use Internal Condom↗

Recent developments in female contraception: LHRH.

During the last few years new approaches to female contraception based on LHRH and its analogs have been developed. The physiological significance of pulsatile LHRH release and its stimulation of the pituitary has been elucidated by recent studies in rhesus monkey. Immunization against LHRH results in complete inhibition of reproductive function in animals and may find as a useful method of long-term fertility control in domestic animals. Clinical studies have utilized this knowledge to treat infertile hypogonadal women with chronic intermittent low-dose of LHRH. The superactive stimulatory LHRH analogs, used to treat infertility, paradoxically proved to have antifertility effects. They induce desensitization of the processes responsible for gonadotropic and gonadal hormone secretion, mediated by specific LHRH receptors in the pituitary and gonad. While contraceptive effectiveness of luteolytic approach remains to be proven, inhibition of ovulation by intranasal LHRH analog administration or continuous LHRH infusion by programmed minipumps seem to provide safe and effective contraception in women.

Amenorrhea↗

Special considerations in pregnancy prevention for the mentally subnormal adolescent female.

Eight retarded teenage girls are presented whose cases highlight some of the considerations in pregnancy prevention for this population. Their mean age was 15.8 years, and 7 were considered to be educable (IQ 50-70) and 1 of borderline intelligence. Presenting complaints included pregnancy, sexual molestation, salpingitis, and a request for contraception in 2 patients each. Pelvic examination with no anesthesia was accomplished after multiple educational sessions in 7 patients. Contraceptive choices included an intrauterine device (2 patients), postcoital estrogen (1 patient), abstinence (1 patient), no contraception (2 patients). Of the 2 pregnant teenagers, 1 elected to continue and 1 to terminate. Unique considerations were the need for current information about consent, alternatives to sterilization, specific risks of contraception for the retarded with medical problems, and communication skills for eliciting sexual information and attitudes. The 8 patients presented reflect the special features posed by the interaction of adolescence, sexuality, and retardation.

Adolescent↗

The return of the pharmaceutical industry to the market of contraception.

In the 1980s and 1990s, the litigious climate in the US had a catastrophic effect on sales of many major contraceptives. Although oral contraceptives escaped controversy, the intrauterine device (IUD) and Norplant(R) were two targets of damaging litigation. The IUD was withdrawn from the market in 1985. Since 1994 when the attacks began against Norplant, its US sales have dramatically declined, even though no fault has been found in the method or its development. In general, pharmaceutical companies were extremely hesitant to develop new contraceptives during this period. The bleak outlook, however, began to shift in the late 1990s, as fertility rates began to decrease worldwide and contraceptive users increased. By 2025, 2500 million women will comprise the customer base for contraception. Global pharmaceutical companies are now participating in expanding markets overseas and have launched and continue to develop a range of new long-term reversible, and highly effective, contraceptive products outside the traditional oral contraceptive field. Two new contraceptives on the way to the US market are: Mirena, a levonorgestrel-releasing intrauterine system manufactured by Schering-Leiras; and Implanon, a single implant system manufactured by Organon of the Netherlands. Other birth control methods soon to be launched include: emergency contraceptives, the contraceptive patch, monthly contraceptive injections, mifepristone for medical abortion, and modified oral contraceptives.

Consumer Behavior↗

Contraception with subdermal levonorgestrel implants as an alternative to surgical contraception at Ilorin, Nigeria.

Acceptability and social characteristics of a cohort of Norplant, IUD, pill and depo-med-roxyprogesterone acetate (DMPA) acceptors who were seen at the University of Ilorin Family Planning Clinic over a 10-week period of the pre-introductory clinical trial of Norplant, are compared. Findings indicate that Norplant and DMPA are adopted as an alternative to sterilization by women advanced in reproductive age and of high parity. The pill and IUD are adopted mainly as birth-spacing methods. Women's education, but not previous use of a contraceptive method, influenced the adoption of Norplant. The continuation rate at 12 months, a measure of acceptability, was highest, 93.7 per 100 women, for Norplant and 77.9, 46.7 and 27.7 per 100 women for the IUD, DMPA and the pill, respectively. The need to address the high family size norms in the African subregion is discussed.

Adolescent↗