Megalis 20 mg and Viagra are both medications used to treat erectile dysfunction (ED) in men, but they contain different active ingredients and have some differences in terms of their characteristics and effects. Here's a comparative analysis:

Active ingredients:

• Megalis 20 tablets: Megalis contains the active ingredient Tadalafil, which is a phosphodiesterase type 5 (PDE5) inhibitor. Tadalafil helps increase blood flow to the penis, allowing for improved erectile function.


• Viagra: Viagra contains the active ingredient Sildenafil citrate, also a PDE5 inhibitor. Sildenafil works in a similar way to Tadalafil, by increasing blood flow to the penis.

Onset of action and duration:

• Megalis 20 mg: Tadalafil has a relatively long duration of action, which can last up to 36 hours. This means that a single dose of Megalis can provide the potential for improved erectile function over a longer period of time.


• Viagra: Sildenafil typically has a shorter duration of action, lasting around 4-6 hours. It is usually taken shortly before sexual activity.