Pearlman says it can often take months to get an appointment with a healthcare provider who can prescribe the medications commonly used to treat ED. It might work longer if you have mild to moderate erectile dysfunction. Get an online prescription and buy from a reputable online service. How oral medicines differ Each oral medicine for ED has a slightly different chemical makeup. If the site offers a subscription service like we do , this can be a very cost-effective solution.Is there an over-the-counter version of Viagra? Can I get Viagra online without seeing a doctor? Currently, there are no over the counter alternatives to Viagra available. September 1, By Matthew Solan, Executive Editor, Harvard Men’s Health Watch Reviewed by Howard E. LeWine, MD, Chief Medical Editor, Harvard Health Publishing . 14th July Manual Health Centre See your GP for a prescription. A prescription from your GP may allow you to get Viagra (or unbranded Sildenafil) for a lower cost than over .