There is no real uniform price for Avanafil 100mg, and its selling price is different in physical and online stores. In addition, there are different manufacturers of Avanafil, so the price is different. Avanafil 100mg is a commonly used clinical dosage form, and one tablet usually ranges from 20 to 60 dollars. Avanafil is a new type of potent phosphodiesterase selective inhibitor, mainly used for the treatment of erectile dysfunction. Avanafil side effects include headache, facial flushing, nasal congestion, nasopharyngitis, and back pain. Avanafil should not be used if the patient is taking nitrates for antihypertensive therapy. Taking Avanafil may also cause allergic reactions such as itching and swelling of the eyelids. Taking this medication needs to be done under the supervision of a doctor.