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Updated: Aug 3, 2026

Construction and Implantation of a Microinfusion System for Sustained Delivery of Neuroactive Agents.
Published on: March 17, 2008
Clinical trial of a long-acting injectable contraceptive: NET-EN
Abstract:
Injectable progestogen, norethisterone enanthate (NET-EN, 200 mg/ml) was administered to 122 women at 2 month intervals for more than 1 year. Only a minority of women had consistently normal cycles. Most women experienced some menstrual irregularities: 57% of users experienced irregular bleeding, 32% developed amenorrhea, while only 11% showed regular cyclic bleeding. Important nonmenstrual side effects were weakness and abdominal pain. No appreciable changes in body weight and blood pressure were recorded.
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