Cialis is an alternative to Viagra and is used for effective treatment of erectile dysfunction. Cialis works by blocking an enzyme called phosphodiesterase-5, which results in the relaxation of penis muscles and increase of the blood flow. As the result, the chances of getting and maintaining an erection for a longer period of time increase significantly. Do not take this medicine if you have an allergy to it. The symptoms of an allergic reaction include trouble breathing, hives, swelling of your face, lips, throat or tongue, rash.
If you are taking any of the following medications tell your doctor about that to avoid possible drug interference: conivaptan, diclofenac, doxazosin, imatinib, prazosin, terazosin, isoniazid, antibiotics, rifampin, antidepressants, seizure medication, HIV/AIDS medicine, heart or blood pressure medications. Cialis overdose symptoms include nausea, irregular heartbeat, fainting, lightheadedness and chest pain. Drinking alcohol may worsen the side effects of Cialis so it's recommended to abstain from any alcoholic drinks while taking the medicine. This medicine should be taken only by the person to whom it was prescribed. Do not share Cialis with other people.