Which one fits you
Tadalafil suits men who want flexibility: one dose that covers a long stretch, or a small daily dose so that timing barely matters. It also helps urinary symptoms from an enlarged prostate. Vardenafil suits men who prefer a shorter-acting pill, who have done well on it before, or who like a tablet that dissolves on the tongue. It is a poor fit for men with long QT syndrome or those taking certain heart rhythm drugs. Both are FDA-approved PDE5 inhibitors, and both need sexual stimulation to work.
The two side by side
| Tadalafil (Cialis) | Vardenafil (Levitra) | |
|---|---|---|
| First U.S. approval | 2003 | 2003 |
| Onset (AUA table) | 60 to 120 minutes | 30 to 60 minutes |
| Duration (AUA table) | Up to 36 hours | Up to 10 hours |
| Effect of a high-fat meal | Not affected | Can blunt the effect |
| Daily option for ED | Yes, low dose once a day | No |
| Other approved use | Urinary symptoms of an enlarged prostate | None for men |
| Forms | Film-coated tablet | Film-coated tablet; orally dissolving tablet |
| Common side effects | Headache, indigestion, back pain, muscle aches, flushing | Headache, flushing, stuffy nose, indigestion, sinus symptoms |
| Special caution | Nitrates, alpha-blockers | Nitrates, alpha-blockers, QT prolongation and class IA or III antiarrhythmics |
How each one works, and why the window differs
Both drugs block PDE5, the enzyme that ends the blood-flow signal in the penis, so the erectile tissue fills more easily during arousal. The difference is how long each one stays active in your body.
Tadalafil clears slowly. The Cialis label reports better erectile function than placebo for up to 36 hours after an as-needed dose, which is why it earned the “weekend pill” nickname. The same label approves a lower dose taken once a day without regard to timing, which keeps a steady level in your blood. Our page on daily versus as-needed tadalafil compares those two approaches.
Vardenafil is closer to sildenafil in its timing. The vardenafil label has men take it about 60 minutes before sex, no more than once a day. The American Urological Association’s ED guideline puts its duration at up to 10 hours. See our vardenafil page for more on dosing ranges and who it suits.
Food, timing and the dissolving tablet
A heavy, fatty meal changes vardenafil more than tadalafil. The vardenafil label reports that high-fat meals cut its peak blood level by 18% to 50%, and the AUA guideline lists a high-fat meal as reducing its effect. Tadalafil is not affected by food. If your evenings usually start with a big dinner, that difference matters.
Vardenafil also comes as an orally dissolving tablet. MedlinePlus explains that it goes on the tongue right after you open the blister, without water, and that it comes in only one strength and cannot be swapped one for one with the regular tablet. Some men find that more discreet; others never notice a difference.
Side effects and the QT caution
Most side effects of both drugs come from PDE5 being present in blood vessels and muscles elsewhere in the body. Tadalafil is more associated with back pain and muscle aches, which typically show up 12 to 24 hours after a dose. Vardenafil is more associated with a stuffy nose. Both can cause headache and flushing.
Vardenafil has one caution tadalafil does not. In a heart-rhythm study, it lengthened the QT interval on an ECG by about as much as the antibiotic moxifloxacin. Its label tells men with congenital QT prolongation, and men taking class IA antiarrhythmics such as quinidine or procainamide or class III drugs such as amiodarone or sotalol, to avoid it. If you take any heart rhythm medicine, bring the bottle or a list to your visit.
Shared rules for both:
- Never with nitrates, including nitroglycerin for chest pain. See our page on ED pills and blood pressure medication for how alpha-blockers and other drugs fit in.
- Alpha-blockers need a stable dose first, then the lowest starting dose of the ED pill.
- Some antifungals, HIV drugs and antibiotics raise the levels of both and change the safe dose.
An erection lasting more than 4 hours, chest pain or sudden vision or hearing loss means stopping and getting emergency care through 911 or an ER.
Convenience and cost
Tadalafil’s main convenience is freedom from planning. With the daily dose, you do not time anything; with the as-needed dose, one tablet can cover a whole evening and the next day. The trade-off is that side effects can linger longer too. Men who already take tadalafil for urinary symptoms may be able to cover both problems with one daily tablet.
Vardenafil’s appeal is a shorter, more predictable window for men who dislike feeling a drug in their system the next day. Both are available as generics, though tadalafil and sildenafil are stocked more widely. If you want to see how the two older pills line up, read our sildenafil versus tadalafil comparison. Ultimate Male does not publish prices; you get a quote for your plan before you begin.
How the clinic helps you pick
Your choice depends on your heart history, the medicines you take and how you want to use the drug. At Ultimate Male, the provider reviews your medication list line by line for nitrates, alpha-blockers and heart rhythm drugs, checks your blood pressure, and asks about any ECG findings or a family history of sudden cardiac death. Men with heart disease or several blood pressure medicines may find our page for men on blood pressure medicines helpful before the visit.
If you have tried one pill without success, the provider also reviews how you took it, since timing and food explain many failures. Same-day labs at San Gabriel or Downey check for low testosterone or blood sugar problems behind the ED. Explore the full menu on our ED medications page, or start with a free 10-minute phone call to talk through which pill fits your routine.
