Answer:
Contact your doctor. They will be able to determine if it could help you, and be able to inform you of the drawbacks including any potential side effects, and then write you a prescription if it is needed.
Contact your doctor first. But if you want to order online, Ive used this one for around 4 years. Its http://www.MedicinesFAST.com - They're based in Arizona and sell Genuine Viagra. Dont order from the ones above. Only order from websites that have a USA mailing address and are PharmacyChecker Approved or VIPPS approved