Side effects are uncommon and generally mild, if you experience any serious pain or side effects which last longer than hours, seek medical attention immediately. While we’ve ensured that everything you read on the Health Centre is medically reviewed and approved, information presented here is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Avoiding antacids: Eating a light meal will help out with this one! Important note: You must be a man over the age of 18 to take Viagra. Viagra is also available in doses of 25mg and mg, so your prescriber will be able to advise whether a lower or higher dose might suit you better.AdFree & Private Online Consultant with Real Doctors. Reliable E.D. Meds Shipped Discreetly. Save Time & Money with Online Prescription for Viagra, Cialis, Sildenafil and Shipping · Real Doctors · Discreet Packaging · Personalized PlanTypes: Testosterone · Erectile Dysfunction · Sertraline · Immune Support · Genital Herpes. written by Felix Team. Viagra is a prescription medication –– you’ll need to talk to a healthcare provider before you begin taking Viagra. While Viagra is safe and effective . Do not take Viagra while taking Revatio and vice-versa. Seek urgent medical advice if an allergic reaction, sudden vision loss, or painful erections lasting more than four hours .