Reviews
Systematic reviews Search a topic, title, author or review id. The Findings tab shows what the reviews found for the same words, grouped by question; the Studies tab shows the primary studies they include.
2 reviews, newest first
Combined oral contraceptive pill for primary dysmenorrhoea Schroll, JB, Black, AY, et al. · Cochrane Database of Systematic Reviews · 2023
Cochrane headline outcomes only
Metformin versus the combined oral contraceptive pill for hirsutism, acne, and menstrual pattern in polycystic ovary syndrome Fraison, E, Kostova, E, et al. · Cochrane Database of Systematic Reviews · 2020
Cochrane headline outcomes only
evidence gaps · evidencegaps.com
Not clinical guidance. Data from the Cochrane Library (Summary of Findings tables and full text), PubMed and Crossref, extracted by the Evidence Gaps pipeline. Related-question groupings and the gap map key are proposals pending human validation. A review that found no studies, or no review at all, is not proof that no research exists.