Sildenafil and tadalafil are two prescription drugs used to treat erectile dysfunction (ED) in men. Here are some lesser-known facts about these drugs:
- Time to onset: Sildenafil has a quicker onset of action, usually taking effect within 30 minutes to an hour after taking the drug. In contrast, tadalafil takes longer to work, with a typical onset time of 1 to 2 hours.
- Duration of action: Tadalafil has a longer duration of action compared to sildenafil. The effects of tadalafil can last up to 36 hours, whereas sildenafil's effects typically last for up to 4 hours.
- Food and alcohol: Sildenafil is affected by food and alcohol consumption, as high-fat meals and alcohol can delay the drug's onset of action. Tadalafil, on the other hand, can be taken with or without food, and alcohol consumption does not significantly affect its efficacy.
- Dosage: The recommended starting dose for sildenafil is 50 mg, while for tadalafil, it is 10 mg. However, depending on the individual's response, the dosage can be increased or decreased.
- Cost: Sildenafil is generally cheaper than tadalafil, making it a more affordable option for some patients.
- Other uses: Tadalafil is also used to treat pulmonary arterial hypertension, a condition in which the blood pressure in the arteries of the lungs is too high. Sildenafil, on the other hand, is sometimes used to treat altitude sickness and Raynaud's phenomenon.

