According to experts at the Mayo Clinic, the first three drugs generally prescribed for erectile dysfunction (ED) are Viagra, Levitra and Cialis. All three of these drugs belong to a class of drugs called phosphodiesterase-5 inhibitors, a type of medication that helps men with ED by increasing the blood flow to the penis. Although these three drugs work similarly, minor differences exist that may affect your personal situation. Knowing these differences will help you make the best decision for your needs.
Viagra
Also known as sildenafil, Viagra helps those suffering from erectile dysfunction by relaxing the blood vessels of your penis during stimulation while increasing blood flow to these blood vessels. According to both the Mayo Clinic and Drugs.com, it should only be taken once a day (generally when needed). Viagra is most effective when taken 30 to 60 minutes prior to sexual intercourse. Erections typically last up to four hours; if they last longer, call your doctor as this can damage your penis.
Common side effects associated with Viagra include nasal congestion, back pain, headache, upset stomach and problems with your memory. More serious side effects include vision changes or loss, irregular heartbeat, shortness of breath, chest pain and fainting.
Levitra
Also known as vardenafil, Levitra helps treat erectile dysfunction much the same way as Viagra. According to Harvard Health Publications, Levitra may work faster than its predecessor by as much as 30 minutes, and has more dosing options. Viagra has a starting dose of 50 milligrams, while Levitra is available in starting doses of 10 milligrams.
According to Drugs.com, Levitra is usually taken as needed and can only be taken once in a 24-hour period. It can be taken with or without food, but should be taken with a glass of water. Common side effects associated with Levitra include redness in your face, neck or chest, memory problems, stuffy nose, and headache. Serious side effects requiring immediate contact with your doctor include chest pain, seizures, vision changes, swelling of your hands, feet and ankles, fainting, and an erection that lasts longer than four hours.
Cialis
Cialis, also known tadalafil, works like Viagra and Levitra in that it increases the levels of the chemical in your body responsible for the relaxation and dilation of your penile blood vessels during stimulation. According to Harvard Health Publications, Cialis lasts longer than both Viagra and Levitra--up to 36 hours. As with the above mentioned medications, Cialis should only be taken once a day, typically before sexual activity.
Common side effects of Cialis include muscle pain, diarrhea, headache, sore throat and upset stomach. More serious side effects include ringing in your ears, seizures, chest pain, fainting, irregular heartbeat, sudden hearing loss and sudden changes in your vision.
