Levitra vs. Cialis: Key Differences for Men Choosing an ED Treatment

Tadalafil (Cialis) and vardenafil (Levitra) are both proven PDE5 inhibitors, but they serve different sexual lifestyles — and choosing between them comes down to how often you have sex, whether you also have urinary symptoms, and how much you want to plan around a pill. For most men, tadalafil's 36-hour window and once-daily option give it a practical edge; vardenafil earns its place for men who want a clean, short-acting on-demand option without a full day of drug on board.

How They Work — and Where They Diverge

Both drugs block the PDE5 enzyme, which normally breaks down cGMP in penile smooth muscle. More cGMP means more nitric oxide–driven relaxation, more blood flow, firmer erections — but only when you're actually aroused. Neither drug creates erections on command. Per AUA clinical practice guidelines, PDE5 inhibitors are first-line pharmacotherapy for ED precisely because that mechanism is well-characterized and the safety record spans more than two decades.

The divergence is pharmacokinetic. Vardenafil peaks in roughly 40–60 minutes and its half-life is about 4–5 hours, so the useful window for intercourse is approximately 4–6 hours [7]. Tadalafil's half-life is ~17.5 hours, supporting efficacy up to 36 hours after a single dose — the pharmacologic basis for its "weekend pill" reputation [3]. Tadalafil is also largely unaffected by food; a high-fat meal can delay vardenafil absorption meaningfully and shorten its peak [14].

Vardenafil's one formulation advantage: it comes as an orally disintegrating tablet (ODT), useful for men with swallowing difficulties or who want a more discreet option. Cialis is tablet-only.

Dosing, Indications, and the BPH Factor

Vardenafil is approved for ED only. Standard on-demand dosing starts at 10 mg, titrating to 20 mg or down to 5 mg. There is no approved once-daily regimen — and research comparing daily vardenafil to on-demand use showed no meaningful advantage to continuous dosing [19].

Tadalafil covers more ground. On-demand: 10–20 mg before sex. Once-daily for ED: 2.5–5 mg taken at the same time each day, which eliminates pre-sex timing entirely. Once-daily at 5 mg is also FDA-approved for BPH and the combined ED/BPH indication — a real differentiator for men in their 50s and 60s managing lower urinary tract symptoms alongside ED [12].

For men who want to explore their full range of ED treatment options — including telehealth-prescribed generic tadalafil — Hims offers both daily and on-demand formats with upfront pricing.

Efficacy: What the Trials Show

Both drugs outperform placebo across mild, moderate, and severe ED in randomized trials. A pooled analysis of tadalafil studies found that among men with moderate ED, 65% on tadalafil 20 mg reported satisfactory intercourse versus 19% on placebo [2]. Vardenafil's North American pivotal trial — a precursor to the Levitra OST 2003 data package — showed overall sexual satisfaction rates of 62% at 20 mg versus 23% for placebo [1].

Head-to-head data are limited, but the EDOS observational study (n = 8,047 across nine European countries) found that tadalafil users reported significantly less concern about timing intercourse around their medication than vardenafil or sildenafil users [10]. That "time concerns" advantage aligns with what men actually report in practice. For a direct comparison of how daily tadalafil stacks up against on-demand sildenafil, see our analysis of Cialis vs. Viagra for daily use.

Vardenafil also has meaningful data in post-prostatectomy ED — a notoriously difficult population — with significant improvements in intercourse satisfaction and orgasmic function versus placebo even after nerve-sparing surgery [4]. That's not a knock on tadalafil, which has similar evidence; it simply confirms vardenafil isn't a second-tier drug.

If you're weighing the full landscape — including non-prescription options like Eroxon (FDA-approved topical alprostadil, 2023) or injectable TriMix for PDE5 non-responders — our guide to ED treatment options without a prescription covers what's actually available in 2026. Men who want clinical oversight alongside medication can find vetted providers through the PeterMD ED treatment program.

Frequently Asked Questions

Which lasts longer, Levitra or Cialis?

Cialis (tadalafil) lasts significantly longer — up to 36 hours per dose versus roughly 4–6 hours for Levitra (vardenafil). This difference comes down to half-life: tadalafil's is approximately 17.5 hours compared to vardenafil's 4–5 hours. For men who want flexibility in when sex happens, tadalafil's window is the clearest pharmacologic advantage it holds over vardenafil.

Can I take Levitra or Cialis every day?

Tadalafil has an FDA-approved once-daily regimen at 2.5–5 mg, which maintains steady-state PDE5 inhibition and removes the need to time a dose before sex. Vardenafil does not have an approved daily regimen — studies comparing daily to on-demand vardenafil showed no added clinical benefit from continuous dosing, so it remains an on-demand-only option in practice.

Which is better if I also have an enlarged prostate?

Tadalafil (Cialis) at 5 mg once daily is the only PDE5 inhibitor with FDA approval for both ED and benign prostatic hyperplasia (BPH). For men