In the US, buying prescription medicine without a prescription is illegal. Besides, rogue pharmacies typically have a poor reputation because they dont have the same type of regulations. If you buy finasteride, it could be actual finasteride, watered down finasteride, or not actually finasteride. It would be tough to tell, unless youd be willing to have a lab test each prescription you get.
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I think there are online doctors that write prescriptions, however Ive nvr really heard stories of ppl actually doing it.