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Preparation and characterization of oil-in-water type poly (D,L-lactic acid) microspheres containing testosterone
S Tsubuku1, S Sugawara, M Miyajima
1Central Research Laboratories, Zeria Pharmaceutical Co., Ltd., Saitama, Japan.
Drug Development and Industrial Pharmacy
|January 7, 1999
Abstract:
Poly (D,L-lactic acid) (PLA) microspheres containing testosterone enanthate (ET) were prepared by using an oil-in-water (O/W) emulsion technique. The size distribution of the microspheres obtained could be explained by a log-normal distribution, and as a result, it was found that ET fully incorporates into microspheres even when the drug is loaded at up to 50%. On the other hand, the dissolution behavior of ET from microspheres was strongly dependent on particle size, suggesting that dissolution of the drug from microspheres can be easily controlled by controlling the preparative conditions.