Injections are dosed at 2. Oral medicine for ED also might not be safe or work well if you have: Very low blood pressure, called hypotension, or uncontrolled high blood pressure, called hypertension. Summary Cialis and Viagra are both pills for treating erectile dysfunction. This creates a vacuum that pulls blood into the penis. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. This includes a heart attack, stroke or a serious heart rhythm disorder in the past six months. We strive to use primary sources and refrain from using tertiary references.Erectile dysfunction: Nonoral treatments. Medicines taken by mouth aren’t the only ways to treat erectile dysfunction. can safely take oral medicine for erectile dysfunction. These medicines include avanafil (Stendra), sildenafil (Viagra), tadalafil (Cialis) and vardenafil. Oral medicine for ED might not work or might be dangerous if you. Viagra is used to treat erectile dysfunction (ED). This is unlike Revatio, which is used to treat pulmonary arterial hypertension. (This is a condition that causes high blood pressure in your lungs.). Cialis, Levitra, Staxyn, and Viagra to Treat ED. Alprostadil for ED. New ED Treatments. Testosterone Replacement Therapy for ED. Alternative Remedies for ED. Yohimbe Bark .