The generic name of Cialis is Tadalafil, which is included in a drug group known as type five phosphodiesterase enzyme inhibitors, and works by providing an increased blood flow in the penis. Its potency has been proven to last up to thirty-eight hours, earning the drug the familiar term of the 'weekend pill.' At present, tadalafil is under clinical procedure trials because of its potential in the effective treatment for pulmonary arterial hypertension, reducing the load efforts of the heart's right ventricle, and consequently reducing the chances for heart failure.

Cialis should be taken with water in an empty stomach. The effects of Cialis can take effect within 30 minutes of ingestion.

The more common adverse effects resulting from the intake of tadalafil include mild to moderate headaches, a stuffed or runny nose, muscle aching, indigestion, flushing of the skin, and back pain. Back and muscle aching may occur anywhere from twelve to 24 hours after drug intake, but usually passes after two days.

Patients with such a heart condition should immediately require medical help if they feel chest pains as a result of the intake of tadalafil. Women are not recommended to take Cialis.

Users who have taken the last dose of Generic Cialis within 48 hours are strongly discouraged to take medicine containing nitrate compounds, such as drugs used to treat angina (glyceryl trinitrate spray). . Consequently people who are using Generic Cialis should similarly refrain from drugs which contain nitrates as a base component. In cases of emergency, Cialis users are advised to provide their attending health care worker or paramedic personnel of their regular intake of tadalafil. People who are allergic to the compound tadalafil are altogether discouraged from taking it. If they are unaware of such a reaction and inadvertently receives a dose, they should immediately purge out the pill, and call a physician.

Generic Cialis is available in 5mg, 10mg, 20mg dosage strengths. The pill is meant to be taken orally, prior to sexual intercourse. The user may or may not precede the drug intake with food. The normal dosage for most men is 10mg, and the dose is adjusted accordingly as needed. The drug is meant to be taken only when needed, but intake must be restricted to only once every day. If a dose is inadvertently missed, take it as long as the next one exceeds the time frame of the last twenty-four hours. Users are encouraged to have preliminary checkups with a doctor before considering on using the drug for impotence treatment; the doctor is more qualified in prescribing the appropriate individual dosage, upon consideration of a user's personal health profile.

A daily dose of tadalafil which is more than the prescribed maximum of 20 mg may lead to renal problems as consequence. In research concerning healthy individual volunteers, single doses of tadalafil to 800mg resulted in side effects which were similar to those incurred with lower dosage strengths, although the incidence rate was significantly increased.

Cialis must be kept in room temperature, not exceeding 30 °C, and inside a sealed container.