Megalis 20 mg, which contains Tadalafil, should typically be taken as needed, but it's important to follow specific dosing guidelines:

Timing: If you take Megalis 20 mg on an as-needed basis, you can take another dose after at least 24 hours. This means you should not take more than one dose within a 24-hour period.

Daily Use: If you are using it as a daily treatment (lower doses may be prescribed), you can take it at the same time each day.

Consult Your Provider: Always follow your healthcare provider's instructions regarding dosing and timing based on your individual health needs and circumstances.

If you're unsure or have specific questions about your dosing schedule, it’s best to consult your healthcare provider for personalized guidance.