Cialis is the trade name for the generic name tadalafil. As the drug is absorbed more rapidly it is recommended to swallow it whole. Tadalafil has the ability to relax smooth muscles and promote blood flow to the penile tissues, facilitating erection. The drug is commonly used in the treatment of erectile dysfunction. Since tadalafil is absorbed more rapidly, crushing or chewing the drug may lead to high blood concentration and cause adverse reactions, so it is recommended to swallow it whole. It should be noted that if headache, dyspepsia, diarrhea and other symptoms occur after using the drug, it is recommended to consult a doctor promptly. If a prolonged erection occurs after using the drug, it is recommended to go to the hospital immediately for emergency treatment, as failure to intervene in time may result in permanent damage to erectile function. The drug is contraindicated in women, minors, the presence of cardiovascular diseases. Tadalafil needs to be administered under the supervision of a clinician.