Can You Take Viagra and Cialis on the Same Day?
Medically reviewed by Linda Girgis | MD, Girgis Family Medicine on August 21st, 2026.
No, you should not take Viagra and Cialis on the same day. Both medications are PDE5 inhibitors that work similarly to treat erectile dysfunction, and combining them significantly increases your risk of dangerous side effects. Taking both together can cause severe drops in blood pressure, potentially leading to fainting, heart problems, or stroke. The FDA specifically warns against combining these medications due to these serious cardiovascular risks. Cialis has a much longer half-life than Viagra, remaining active in your system for up to 36 hours compared to Viagra's 4-6 hours. If you're considering switching between medications, consult your healthcare provider about proper timing and dosing to ensure your safety.
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