Injectable long-acting drug delivery systems( DDS) for contraception can achieve several advantages:( 1) to maintain a constant drug concentration in the blood circulation;( 2) to provide an opportunity to control a precise drug release rate for several weeks or even months;( 3) to improve patient compliance and continuation rate than other currently used contraceptive agents by decreasing invasive administration and dosing frequencies; and( 4) to provide a relatively safe,efficient and simple contraception...
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