Utilization patterns of oral contraceptives in UK general practice

The aim of this article was to analyze and compare recent oral contraceptive utilization patterns in UK general practice. The database comprised at least 12 months of medical records during 1990-1991 from 693, 705 women aged 14-45 years registered with 398 practices. The database was searched for OC utilization patterns with emphasis on differences between combined OCs containing levonorgestrel (LNG), desogestrel (DSG), or gestodene (GSD). Women using OCs with LNG were older, more likely to be long-term users, and less likely to be starters or switchers than women using OCs with DSG or GSD. Use patterns of triphasic LNG did not differ markedly from that of monophasic LNG-containing OCs. Use of Schering PC4 a postcoital preparation peaked among women <20 years, whereas progestogen-only pills were prescribed mainly to women >30 years. The different utilization patterns between women using LNG-containing OCs and those using OCs containing DSG or GSD should be taken into account when making comparisons of the incidences of side effects.