Tadalafil vs Sildenafil: Which Is Better for Erectile Dysfunction?

Duration, food effects, daily dosing, side effects and which suits your lifestyle.

Part of the Access Doctor Erectile Dysfunction guide.

How Both Medications Work

Both sildenafil and tadalafil are PDE5 inhibitors. They block the phosphodiesterase type 5 enzyme in penile smooth muscle, preventing the breakdown of cyclic GMP (cGMP). The resulting accumulation of cGMP allows blood vessels in the penis to relax more easily when sexually stimulated, enabling increased blood flow and facilitating an erection. Sexual stimulation is required with both medications.

Because they share a mechanism, they also share most benefits and risks. For a deeper look at each on its own, see our guides to sildenafil uses and tadalafil uses.

Key Differences: Tadalafil vs Sildenafil

When Sildenafil Is the Better Choice

• You prefer a shorter-acting medication with a defined window of effectiveness
• Cost is a consideration — sildenafil generics are widely available at lower prices
• You prefer to take medication only immediately before planned sexual activity
• You are already using sildenafil and it is working well

When Tadalafil Is the Better Choice

• You want more spontaneity — not planning sex around medication timing
• You have sex frequently (more than twice a week) — daily 5mg tadalafil may be more convenient and cost-effective
• You also have urinary symptoms from an enlarged prostate (BPH) — daily tadalafil treats both at once
• You prefer to take medication with food without worrying about absorption effects

Side Effects — Similarities and Differences

Both share similar common side effects: headache, flushing, nasal congestion, and indigestion. Notable differences:

Both carry the same important safety rule: never take them with nitrates (including GTN sprays and poppers), as the combination can cause a dangerous drop in blood pressure. A clinical assessment before prescribing checks for this and other risks.