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Cialis is a prescription phosphodiesterase type 5 inhibitor containing tadalafil. It is approved for erectile dysfunction, the signs and symptoms of benign prostatic hyperplasia, and men who have both conditions. Tablets come in 5 mg, 10 mg, and 20 mg strengths under the current U.S. label.
read more about cialis ...Tadalafil inhibits phosphodiesterase type 5, which slows breakdown of cyclic GMP. During sexual stimulation, increased cyclic GMP in penile tissue relaxes smooth muscle and increases blood flow, helping produce an erection. PDE5 inhibition also affects smooth muscle in the lower urinary tract, which is associated with improvement in benign prostatic hyperplasia symptoms.
Cialis is used in adult men with erectile dysfunction, signs and symptoms of benign prostatic hyperplasia, or both conditions. It does not protect against sexually transmitted infections. Men advised to avoid sexual activity due cardiovascular status require medical assessment before erectile dysfunction treatment.
For erectile dysfunction as needed, most patients start with 10 mg before anticipated sexual activity, with adjustment to 5 mg or 20 mg according to response and tolerability. Once-daily erectile dysfunction treatment starts at 2.5 mg and can increase to 5 mg. Benign prostatic hyperplasia treatment uses 5 mg once daily.
Cialis is contraindicated with organic nitrates and guanylate cyclase stimulators such as riociguat due the risk of severe low blood pressure. Other serious concerns include prolonged erection, priapism, sudden vision loss, sudden hearing loss, and symptomatic hypotension. Alpha blockers, antihypertensive medicines, alcohol, kidney disease, and liver disease can affect safe use.
Cialis treats erectile dysfunction, benign prostatic hyperplasia symptoms, and men who have both conditions.
Clinical studies found improved erectile function for up to 36 hours after an as-needed dose.
Yes. Once-daily regimens are labeled for erectile dysfunction, benign prostatic hyperplasia, or both conditions.
No. Organic nitrates are contraindicated with Cialis due the risk of a dangerous drop in blood pressure.
CIALIS (tadalafil) Patient Information. https://pi.lilly.com/us/cialis-ppi.pdf. Date Accessed September 22, 2026.
CIALIS (tadalafil) Prescribing Information. https://pi.lilly.com/us/cialis-pi.pdf. Date Accessed September 22, 2026.
DailyMed - CIALIS (tadalafil) tablet, film coated. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=bcd8f8ab-81a2-4891-83db-24a0b0e25895. Date Accessed September 22, 2026.
Tadalafil. MedlinePlus. https://medlineplus.gov/druginfo/meds/a604008.html. Date Accessed September 22, 2026.
Tadalafil. PubChem. https://pubchem.ncbi.nlm.nih.gov/compound/tadalafil. Date Accessed September 22, 2026.