Vidalista 40 and Viagra are both medications used to treat erectile dysfunction (ED), but they work in slightly different ways and may vary in how quickly they start working for different people.

Vidalista 40 contains the active ingredient Tadalafil, while Viagra contains Sildenafil. Both of these ingredients belong to a class of medications called phosphodiesterase type 5 (PDE5) inhibitors, which work by increasing blood flow to the penis during sexual stimulation, thus helping to achieve and maintain an erection.

In general, Viagra typically starts working within 30 to 60 minutes after taking it on an empty stomach. However, it may take longer if you've consumed a heavy or fatty meal before taking it. Viagra's effects can last for around 4 to 6 hours.

On the other hand, Vidalista 40, which contains Tadalafil, may start working within 30 minutes to 2 hours after taking it, with its effects lasting for up to 36 hours. This longer duration of action is one of the key differences between Tadalafil (Vidalista) and Sildenafil (Viagra). Additionally, Tadalafil can be taken with or without food, which may be more convenient for some people.

So, while Viagra may start working slightly faster for some individuals, Vidalista 40 may offer a longer duration of action, providing a wider window of opportunity for sexual activity. It's important to note that individual responses to these medications can vary, so it's essential to follow your doctor's recommendations and dosage instructions for the best results and to minimize any potential side effects.