Key Specs Cost: Consultation prices vary based on the prescriber; $5 generic prescriptions Medical Consultation Required: Yes Medications Prescribed: .Most online providers require a picture of a valid ID, a selfie showing your face, and a recent blood pressure reading taken with a home blood pressure monitor or by a medical provider. If approved, the provider will issue a prescription. There are many safe, reliable online services offering ED prescriptions. Cialis tadalafil : This ED medication works with the same principle as Viagra, but lasts up to 36 hours. Other conditions that may disqualify you from an ED prescription include a history of stroke, kidney or liver disease, cancer, diabetes, or a bleeding disorder.Headache, flushing, and upset stomach are common Viagra side effects. These effects are usually mild and often resolve on their own. While rare, Viagra can cause an erection that lasts longer than 4 hours (priapism). This can result in permanent damage if left untreated. Vision changes are also possible. Viagra and its generics are available as 25 mg, 50 mg, and mg tablets. 5 pharmacist-backed tips for taking Viagra. At first glance, Viagra’s directions may seem straightforward. The recommended starting dose for Viagra is 1 tablet (50 mg) by mouth 1 hour before sexual activity. But depending on your response to the medication, you can. Viagra dosage for erectile dysfunction (ED) is usually milligrams (mg), but those over 65 may start at 25 mg. Your doctor will also need to consider possible drug interactions.A phone or video consultation is sometimes required for legal purposes. Here are some key factors to consider when deciding: Pricing: Know how much your monthly supply will cost with shipping and tax. We also looked at additional services, such as access to digital pharmacies and home delivery options. Payment options: Consider how you’d like to pay. What Are the Symptoms of Erectile Dysfunction? Most online providers require a picture of a valid ID, a selfie showing your face, and a recent blood pressure reading taken with a home blood pressure monitor or by a medical provider.