Avanafil is usually available in large pharmacies, and can be purchased from a regular pharmacy or online pharmacy, but a doctor’s prescription is required. Avanafil belongs to the phosphodiesterase inhibitors, is the treatment of male erectile dysfunction drugs, can make the penile blood vessels dilation, stimulation of the cavernous body of the penis, can increase the blood flow to the penis, can play a role in maintaining a very good erection hardness and erection time, so as to improve the erectile function of men. The drug is usually available in large pharmacies, but it is a prescription drug and must be purchased with a doctor’s prescription. Avanafil may appear flushing, nausea, vomiting, dizziness and other symptoms after taking it, usually the symptoms are not obvious, it will disappear on its own, angina pectoris, myocardial ischemia, or taking nitrate drugs are prohibited from use, to avoid the impact on the health of the body. Drugs should be taken correctly under the guidance of a doctor, to avoid unauthorized use of the body to cause unnecessary damage.