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Walgreens
2141 Chestnut Street
Pharmacy· 10 min from marina (823m)
This Walgreens at 459 Powell St keeps its pharmacy open 24 hours (with a brief 1:30–2am meal break), so you can pick up prescriptions or last-minute essentials at pretty much any hour. You can also refill prescriptions ahead of time and have them ready for pickup, which saves a lot of standing around waiting.
Sources: walgreens.com