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Before taking Viagra, discuss your health with a provider, especially if you have heart problems or take nitrates for chest pain, as the combination can cause a dangerous drop in blood pressure . Common side effects may include headaches, flushing, or an upset stomach.

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: It typically starts working within 30 to 60 minutes , though it can work as early as 12 minutes for some . It is most effective when taken on an empty stomach about an hour before sexual activity . Before taking Viagra, discuss your health with a

: The standard starting dose is 50 mg , but a doctor may adjust this to 25 mg or a maximum of 100 mg per day . You should never take more than one dose in a 24-hour period . : It typically starts working within 30 to

To legally and safely obtain Viagra, you must follow a process that involves a healthcare professional:

: Viagra is a prescription-only medication . You must consult with a licensed doctor—either in person or through a reputable telehealth service—who can evaluate if the medication is safe for you based on your medical history and other medications you may be taking .