Write down any symptoms you’ve had, including any that might seem unrelated to erectile dysfunction. Medicines that you take by mouth are called oral medicines. You can take sildenafil with or without food. Severe liver disease. Avanafil Stendra. The body takes longer to absorb it after a high-fat meal or alcohol. Your doctor or other health care professional can recommend one for you based on these factors, other health conditions you have and any other medicines you take.Do not take VIAGRA if you: take any medicines called nitrates, often prescribed for chest pain, or guanylate cyclase stimulators like Adempas (riociguat) for pulmonary . If you are taking sildenafil (Viagra) for erectile dysfunction, do not take any more doses of sildenafil (Viagra) or similar medications such as tadalafil (Cialis) or vardenafil (Levitra) . If you’re holding out for a generic version of branded Viagra, you won’t have to wait much longer. Teva Pharmaceuticals plans to release its generic of the “little blue pill” as early .