: 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 .

If you're looking to purchase online, it's essential to ensure you're getting the authentic medication manufactured by Pfizer . Buying prescription drugs online requires caution to avoid counterfeit products and ensure patient safety. How to Safely Buy Viagra Online

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.

: 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 .

For official product details and safety information, you can visit the or consult the Mayo Clinic's guide to ED medications .