Medicines that you take by mouth are called oral medicines. There were some reports of headaches and nausea, however. Side effects Side effects of oral ED medicines are often mild. Thus, men who prefer a bit more spontaneity in their sex lives will often turn to Tadalafil. These include itraconazole Sporanox, Tolsura , ketoconazole Extina, Ketozole, others and ritonavir Norvir.Is there anything over the counter that works like Viagra? Many over-the-counter (OTC) treatments, including herbal supplements, claim to be able to treat ED, but none of these . If you do buy medicines over the internet: Check to see if an online pharmacy is legitimate. Never order medicines from an online pharmacy that doesn’t list its phone number and . Can I buy generic Viagra online? The safest way to get a prescription for Viagra is from your doctor. You can even do this over a telehealth call (on the phone or computer) in .