This makes beach vacations very difficult. I've read some articles that say wait for at least 30 minutes. Not sure how to proceed
In general, one needs to leave Rogaine on the scalp at least 4 hours (and ideally even longer) in order for it to have any effect. 50 % of the drug is absorbed by 1 hr, and 75% by 4 hrs.
Going swimming 30 minutes after applying simply washes it off. One needs to find a time during the day where they can leave it on the scalp for many hours.
MEDICAL REFERENCE OF INTEREST
Ferry JJ et al. Relationship between contact time of applied dose and percutaneous absorption of minoxidil from a topical solution. J Pharm Sci. 1990 Jun;79(6):483-6.
Jeff Donovan MD PhD FRCPC FAAD
US & Canadian board-certified Dermatologist
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