Combined oral contraceptive pill (COC) and high altitude
CHC use at high altitude
Women trekking to high altitudes (above 4500 m or 14 500 feet) for periods of more than 1 week may be advised to consider switching to a safer alternative contraceptive method
Exposure to high altitude results in an increase in erythropoiesis and in the risk of thrombosis
Reference:
- FSRH (July 2019). Combined Hormonal Contraception
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