· Cialis; Descriptions. Tadalafil is used to treat men who have erectile dysfunction (also called sexual impotence). Tadalafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where .The dose of CIALIS for use as needed should be limited to 10 mg no more than once every 72 hours in patients taking potent inhibitors of CYP3A4 such as ritonavir, ketoconazole, and itraconazole [see Drug Interactions 7. Men with BPH usually have difficulty urinating, a decreased flow of urination, hesitation at the beginning of urination, and a need to get up at night to urinate. Tadalafil comes as a tablet to take by mouth. You may take this medicine with or without food. Patients with known hereditary degenerative retinal disorders, including retinitis pigmentosa, were not included in the clinical trials, and use in these patients is not recommended. Ask your healthcare professional how you should dispose of any medicine you do not use. Sexual activity may be a strain on your heart, especially if you have heart disease. · Cialis comes as a tablet that you swallow. It’s available in four strengths: milligrams (mg), 5 mg, 10 mg, 20 mg. Depending on your situation and what condition Cialis is treating. Side Effects. Headache, stomach upset, back pain, muscle pain, stuffy nose, flushing, or dizziness may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. To. A study found that from to , the median price of Cialis jumped from $ to $ for 30 tablets. Generic brands start at around $ for 30 tablets. Generic brands start at around.If you are a Mayo Clinic patient, this could include protected health information. Hypersensitivity reactions have been reported, including Stevens-Johnson syndrome and exfoliative dermatitis [see Adverse Reactions 6. Tadalafil is sometimes taken as needed, usually at least 30 minutes before sexual activity and not more often than once every 24 hours. When the smaller blood vessels in the lungs become more resistant to blood flow, the right ventricle must work harder to pump enough blood through the lungs. Such an event may be a sign of non-arteritic anterior ischemic optic neuropathy NAION , a rare condition and a cause of decreased vision, including permanent loss of vision, that has been reported rarely postmarketing in temporal association with the use of all PDE5 inhibitors. You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. Keep from freezing.