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Compare Cialis vs Viagra vs Levitra

Please note that Viagra, Cialis and Levitra only help men with erectile dysfunction to get an erection only when he is sexually excited. Viagra, Cialis and Levitra are NOT aphrodisiacs! They will not increase your libido.

Criteria	Viagra	Cialis	Levitra
Brand Name Manufacturer	Pfizer	Lilly Icos	Bayer
When to take it prior to sex?	30 minutes	30 minutes	25 to 45 minutes
How long does it work?	up to 5 hours	up to 36 hours	up to 6 hours
Dosage	25mg, 50mg, 100mg	10mg, 20mg	2.5mg, 5mg, 10mg, 20mg
Advantages	Viagra is very well known and a proven effective treatment.	Cialis has few side effects and lasts longer in the body to increase spontaneity than either Levitra or Viagra.	Levitra comes prepared in 3 different dosages which means you more precisely tailor the dose easily to maximise potency while minimising side effects. Levitra can be taken with food while Viagra should be taken on an empty stomach.
Side Effects	Headache, flushing, stomach upset, nasal stuffiness, diarrhea and dizziness, painful or other urination problems, vision problems, skin rash. Should not be used if you are using and M.A.O. inhibitors.	The most common side effects with CIALIS were headache and upset stomach. Backache and muscle ache were also reported, sometimes with delayed onset. Most men weren't bothered by the side effects enough to stop taking CIALIS. In rare instances, men taking prescription ED tablets (including CIALIS) reported a sudden decrease or loss of vision. It's not possible to determine if these events are related directly to the ED tablets or to other factors. If you have a sudden decrease or loss of vision, stop taking any ED tablet and call your doctor right away.	The most commonly reported side effects were headache, flushing, and stuffy or runny nose. In rare instances, men taking PDE5 inhibitors (oral erectile dysfunction medicine, including LEVITRA) reported a sudden decrease or loss of vision in one or both eyes. It is not possible to determine whether these events are related directly to these medicines or to other factors. If you experience sudden decrease or loss of vision, stop taking PDE5 inhibitors, including LEVITRA, and call a doctor right away.
Contraindications	If you take any medicines that have nitrates in them (like nitroglycerin for chest pain)—every day or even once in a while—you should NOT take VIAGRA.	Don't take CIALIS if you take nitrates, often prescribed for chest pain, as this may cause a sudden, unsafe drop in blood pressure.	Men taking nitrate drugs, often used to control chest pain (also known as angina), should not take LEVITRA. Such combinations could cause blood pressure to drop to an unsafe level.