Abstract | CONTEXT: Hormonal male contraceptive regimens effectively and reversibly suppress sperm production, but there are few large-scale efficacy studies. OBJECTIVE: DESIGN: This was a multicenter, phase III, contraceptive efficacy clinical trial. PARTICIPANTS: A total of 1045 healthy fertile Chinese men were recruited throughout China into the study. INTERVENTION(S):
Injections of 500 mg TU were administered monthly for 30 months. A definition of severe oligozoospermia (< or =1 x 10(6)/ml) was used as a criterion of spermatogenic suppression and as the threshold for entering the contraceptive efficacy phase. MAIN OUTCOME MEASURE(S): The primary outcome was pregnancy rate in the partner. Other outcomes include: semen parameters, testis volumes, reproductive hormone levels, and safety laboratory tests. RESULTS: Forty-three participants (4.8%) did not achieve azoospermia or severe oligozoospermia within the 6-month suppression phase. A total of 855 participants entered into the efficacy phase, and 733 participants completed monthly TU treatment and follow-up. There were nine pregnancies in 1554.1 person-years of exposure in the 24-month efficacy phase for a cumulative contraceptive failure rate of 1.1 per 100 men. The combined method failure rate was 6.1%, comprising 4.8% with inadequate suppression and 1.3% with postsuppression sperm rebound. No serious adverse events were reported. Spermatogenesis returned to the normal fertile reference range in all but two participants. CONCLUSIONS: Monthly injection of 500 mg TU provides safe, effective, reversible, and reliable contraception in a high proportion of healthy fertile Chinese men.
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Authors | Yiqun Gu, Xiaowei Liang, Weixiong Wu, Minli Liu, Shuxiu Song, Lifa Cheng, Liwei Bo, Chengliang Xiong, Xinghai Wang, Xiaozhang Liu, Lin Peng, Kangshou Yao |
Journal | The Journal of clinical endocrinology and metabolism
(J Clin Endocrinol Metab)
Vol. 94
Issue 6
Pg. 1910-5
(Jun 2009)
ISSN: 1945-7197 [Electronic] United States |
PMID | 19293262
(Publication Type: Clinical Trial, Phase III, Journal Article, Multicenter Study, Research Support, Non-U.S. Gov't)
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Chemical References |
- Contraceptive Agents, Male
- Testosterone
- testosterone undecanoate
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Topics |
- Adolescent
- Adult
- Algorithms
- China
- Contraception
(adverse effects, methods)
- Contraceptive Agents, Male
(administration & dosage, adverse effects)
- Feasibility Studies
- Female
- Humans
- Injections, Intramuscular
- Male
- Middle Aged
- Patient Compliance
- Sperm Count
- Testosterone
(administration & dosage, adverse effects, analogs & derivatives)
- Treatment Outcome
- Young Adult
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