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Biomedical subjects

A A Ismail

Publications and source records attributed to A A Ismail.

At least 127 records · Page 7Linked to original sources
PubMed1975

Cyproterone acetate: a study involving two volunteers with idiopathic hirsutism.

Two female volunteers, of menstrual age, with severe idiopathic hirsutism were treated for eight cycles and fifteen cycles respectively with cyproterone acetate 50 mg twice daily on days 5-14 of the cycle. In all but one cycle, ethinyl oestradiol in a dose of 50 mug daily from day 5 to 21 was given in addition. Cyproterone acetate when given alone abolished the mid-cycle LH surge. Combined therapy with cyproterone acetate and ethinyl oestradiol produced a significant improvement in both patients' hirsutism and was accompanied by a marked reduction in the urinary excretion of LH, FSH and androgens and by a fall in plasma testosterone. However, the clinical benefit derived from this drug was due principally to its action as a peripheral antiandrogen.

Adult↗
PubMed1975

Dissolution studies on paracetamol solidified melt prepared under different cooling rates.

Regulating the cooling rate of paracetamol melt resulted in the formation of different microcrystalline structures of the solidified melt. Dissolution rate studies were carried out on powdered samples prepared from fused paracetamol that was crystallized under different conditions. Rapid cooling associated with stirring the melt during crystallisation produced a fast rate of dissolution in the order of two times greater than the untreated drug. Increased dissolution rate data were masked to some extent when working with tablets prepared from the corresponsing solidified and powdered melts. The present study represent a new method of physical modification of drugs as a means of increasing rate of drug dissolution and absorption.

Acetaminophen↗
PubMed1975

The effect of crystal forms of some barbiturates on their pharmaceutical properties. Part 1: Phenobarbitone.

Up to 13 polymorphic forms of phenobarbitone have been reported in the literature. By melting the commercial sample and cooling under specified controlled conditions, three polymorphic forms II, II, XII, and a mixed form of II and III were obtained. The interconversion of the different forms was studied by special procedures including suspension in water, heating, and heavy dry grinding. The hydrated form XIII and a new hydrated one, designated XIV, were produced by suspending different other forms in water. Heating was found to affect transformation from any form to form I. IR spectroscopy and hot stage microscopy were used for the identification of the different polymorphic forms. Initial dissolution rate studies were carried out on only five forms. The dissolution rate constants were in the following decreasing order: II greater than III greater than I greater than XIV greater than XIII. Form II was found to dissolve at a rate constant about twice that of both hydrated forms.

Chemical Phenomena↗