Tadalista CT 20mg contains tadalafil, which is often used to treat erectile dysfunction. The timing for taking this medication can vary depending on the specific instructions from your healthcare provider, but generally:

Take it about 30 minutes before sexual activity if you're using it on an as-needed basis. It can work for up to 36 hours, so you don’t need to take it immediately before sex every time.

If you're taking it daily (low dose), take it at the same time every day, regardless of sexual activity.

It's best to avoid taking it with a heavy meal, as this might delay the onset of action. Make sure to follow your doctor's instructions and not exceed the recommended dose.