Can you take more than one tab at a time? May 19, 2023 18:20 Updated No, you should only take one tab or half a tab at a time as prescribed by your doctor. Related to caution instructions Related articles How long do the effects of the ED meds last? Do you take the whole tab at once? Do ED meds expire? Can I cancel my prescription at any time? When is the best time to take ED meds?