What type of drug is Cialis?
The pharmaceutical compound used in Cialis is tadalafil, a phosphodiesterase inhibitor that treats the medical condition called erectile dysfunction.

How does it work?
Tadalafil works by relaxing all the muscles and tissues in the penis, thus stimulating a strong stream of blood into the penis. When a man is sexually aroused, a firm erection will be possible so that he will be able to engage in sexual intercourse.

What is the dosage?
In most cases the doctor will prescribe a dose of 10mg to be taken with water approximately 30 minutes before sexual activity. Cialis does not have to be taken with food. The helpful effects of Cialis may continue for 36 hours after a dose. During this period an erection will be possible during sexual stimulation.

Always adhere to your doctor’s instructions regarding dosage.

Essential Information about Cialis
Avoid taking Cialis if you are being treated for any medical condition with any of the following pharmaceutical substances: erythromycin, nitrates, terazosin, prazosin or guandadrel. Avoid taking Cialis if you are taking drugs to treat AIDS. The simultaneous use of these drugs with Cialis can result in severe side effects and an increased risk of stroke or heart attack.

Cialis may be dangerous if you have high blood pressure that is being treated with a beta-blocker.

Limit your intake of alcohol when taking Cialis. If you drink a lot of alcohol you could be at risk of dizziness, increased heart rate, headache, or low blood pressure.

If after, or during, sex your chest gets tight, or you feel nauseous or dizzy, or if your face or arms start tingling or burning, you must call a doctor quickly. Do not take any more doses of Cialis until you have been seen by a doctor.

After using Cialis, some men experience a prolonged or painful erection. If this happens to you, seek medical help. This is very dangerous and it could result in permanent impotency.

When you first visit your doctor, be sure to tell him or her if you have suffered with any of the following medical conditions: retinitis pigmentosa, stomach ulcers, blood pressure (high or low), heart problems, stroke, liver problems, kidney problems, or any problems with your penis.

Also tell the doctor the names of all medicines you are using, whether they are prescriptive or non-prescriptive. Tell the doctor if you use vitamin supplements or herbal medicines.

Females may not use Cialis. This drug is for adult males only.

Likely side effects
Serious: tight chest, swelling of ankles or legs, vomiting, dizziness, nausea, tingling or swelling in the facial area or arms, difficulty breathing, hives, or severe rash. Any of these should receive urgent medical attention.

Any sudden loss of vision should be instantly referred to a doctor. This may be indicative of an extremely dangerous optic nerve condition called NAION.

Common: blocked or stuffy nose, flushing of the face, indigestion, vision changes, back or muscle aches, or headache. If any of these persevere for more than 2-3 days, report to your doctor.