What is the difference between Cialis and Viagra?

Cialis and Viagra are both medications used to treat erectile dysfunction, but they contain different active ingredients: Cialis contains tadalafil, while Viagra contains sildenafil. The main clinical difference between them is their duration of action. Viagra typically lasts around 4–5 hours, whereas Cialis can last up to 36 hours. Both medicines require sexual stimulation to be effective.

Key points:

Duration: Cialis can work for up to 36 hours, allowing greater flexibility, while Viagra usually works for around 4–5 hours.
Onset: Both medications usually start to work within 30–60 minutes, although some people may respond sooner. Onset can be delayed by a heavy or high-fat meal, particularly with Viagra.
Side effects: Both can cause similar side effects such as headache, flushing, indigestion, or nasal congestion. Cialis-related side effects may last longer due to its longer duration of action.
Dosing options: Cialis is available as both a when-needed dose and a daily low-dose option, while Viagra is typically taken when needed.

This text has been fact-checked for accuracy by Sorin Romaniuc, Pharmacist at medino.