Patients who have an erection lasting greater than 4 hours, whether painful or not, should seek emergency medical attention. The trade-off is that the higher the strength, the greater the chance of side-effects and adverse events. How long does Cialis last? Can Cialis be used with other treatments for impotence? This condition affects millions worldwide, causing stress and relationship issues. Information Access: Online pharmacies often provide detailed information about the drug, including its uses, side effects, and contraindications. Patients with severely impaired autonomic control of blood pressure may be particularly sensitive to the actions of vasodilators, including PDE5 inhibitors. · It’s available in four strengths: milligrams (mg), 5 mg, 10 mg, 20 mg. Depending on your situation and what condition Cialis is treating, you’ll take the drug either before sexual activity. Tadalafil oral tablet is available as a generic drug and as brand-name drugs. Brand names: Cialis, Adcirca. Tadalafil comes only as a tablet you take by mouth. Tadalafil is used to treat the. Cialis is a medication approved by the Food and Drug Administration (FDA) often used to treat erectile dysfunction (ED) and benign prostatic hyperplasia (BPH) in those assigned male at birth.