Levitra vs Cialis: Duration, Timing and Side Effects

Ask ten men which erectile dysfunction pill they would pick if they could choose again, and you will hear a surprising range of answers. Some value the long window of tadalafil (Cialis) that lets an evening unfold without a stopwatch. Others prefer the shorter, more defined window of vardenafil (Levitra) and its predictable relationship to the clock. Neither group is wrong. These two medicines belong to the same family, work through the same mechanism and are both effective, yet they feel quite different in daily life.

This guide compares them in a head-to-head format with six rounds: speed, duration, food, side effects, safety flags and everyday fit. After the rounds, you will find a patient-profile matrix, a plain-text decision path and a short list of questions to take to your prescriber. One practical note first: the Levitra brand name has been discontinued in the United States, so a prescription for it is now filled with generic vardenafil, the same active ingredient. This article uses “Levitra” and “vardenafil” interchangeably.

Meet the contenders

Vardenafil (Levitra)

Vardenafil was approved by the FDA in 2003. It is a PDE5 inhibitor, meaning it blocks an enzyme that breaks down the chemical signal that relaxes blood vessels in the penis during arousal. It is taken as needed, generally about an hour before sexual activity. The brand has been discontinued in the United States, but generic vardenafil, including an orally disintegrating tablet version, remains available by prescription. The U.S. FDA’s 2023 Federal Register notice on the discontinued Levitra tablets deals with the status of the brand in the agency’s drug listings.

Tadalafil (Cialis)

Tadalafil was approved in the same year and works through the same enzyme. What sets it apart is its long half-life, roughly 17 hours, which is why it can remain active for a day and a half. It comes in as-needed doses and in a low daily dose. Tadalafil is also approved for the urinary symptoms of benign prostatic hyperplasia (BPH), the non-cancerous enlargement of the prostate. Our related guides, Cialis daily vs as-needed and how long Cialis takes to work, go deeper into its dosing styles.

Round 1: Speed of onset

Vardenafil: Many men notice an effect within roughly 30 to 60 minutes on an empty stomach, and the prescribing information describes taking it about an hour before activity. Some report responding sooner, particularly with the orally disintegrating form, but individual variation is wide.

Tadalafil: The labeled approach is to take it at least 30 minutes before activity, and many men feel an effect somewhere between 30 minutes and 2 hours. Its peak concentration tends to arrive later than with the shorter-acting drugs.

Verdict: A slight edge to vardenafil for men who want a predictable effect within an hour, though in real life the gap is modest. For a detailed minute-by-minute breakdown of vardenafil, see how long Levitra takes to work.

Round 2: Duration of effect

Vardenafil: Its half-life is around 4 to 5 hours, and the effect is generally described as lasting about 4 to 5 hours. That is long enough for most evenings, though not for a whole weekend.

Tadalafil: Its half-life of about 17 hours gives it a window that can stretch up to 36 hours, which is why it earned the nickname “the weekend pill.” That does not mean you will have a continuous erection for a day and a half. It means that if you are aroused at any point during that window, the medicine is likely to still be supporting the response.

Verdict: A clear edge to tadalafil for flexibility and spontaneity. A clear edge to vardenafil for men who prefer the medicine to clear out of their system sooner, perhaps because they are sensitive to side effects or take other drugs that interact.

Round 3: Food and meals

Vardenafil: The label allows use with or without food, but a high-fat meal can delay and reduce the peak. If a dinner out is part of your plan, the same principles in our article on how food affects sildenafil apply, albeit to a different degree: keep the meal light and leave a gap.

Tadalafil: Its absorption is not meaningfully affected by food. A big dinner does not usually change the result, which takes a variable out of the equation. See does food affect Cialis for the details.

Verdict: Edge to tadalafil, especially for men who eat late or dine out often.

Round 4: Side effects

Because both drugs inhibit the same enzyme, their side effects overlap substantially. The differences are mostly at the margins.

Side effect	Vardenafil (Levitra)	Tadalafil (Cialis)
Headache	Common	Common
Flushing	Common	Common
Stuffy or runny nose	Common	Common
Indigestion or heartburn	Common	Common
Dizziness	Occasional	Occasional
Back pain and muscle aches	Less typical	More typical, often appearing 12 to 24 hours after a dose
Visual changes	Possible	Possible, though color-tint effects are a hallmark of sildenafil
How long side effects linger	Usually a few hours	Can persist longer due to the longer half-life

Verdict: Roughly even. The long duration of tadalafil means that any side effect that does occur can last longer, while vardenafil’s shorter window means problems fade sooner. If you are prone to muscle aches, vardenafil may be gentler; if you want to avoid the strong flushing some men get, response varies, and a trial is the only reliable test.

Round 5: Safety flags that can decide the question

This is the round where medical history matters more than preference.

Shared rules for both drugs

• Never combine with nitrates (nitroglycerin, isosorbide, or recreational nitrites such as poppers). The result can be a dangerous fall in blood pressure.
• Do not combine with riociguat, a pulmonary hypertension medicine.
• Use caution with alpha-blockers and other blood pressure medicines. Your prescriber may start at a low dose and may separate the timing.
• Do not use two ED medicines together.
• Seek emergency care for an erection lasting more than four hours, sudden vision loss in one or both eyes, sudden hearing loss, chest pain, or fainting.

Vardenafil-specific cautions

• It can affect heart rhythm by prolonging the QT interval slightly. It is generally avoided in men with congenital long QT syndrome and in those taking certain antiarrhythmic medicines such as quinidine, procainamide, amiodarone or sotalol.
• Strong CYP3A4 inhibitors, including some HIV protease inhibitors and certain antifungals and antibiotics, require much lower doses or avoidance.
• Men over 65 and those with moderate liver impairment are typically started on a lower dose.

Tadalafil-specific cautions

• Strong CYP3A4 inhibitors also affect tadalafil and require dose limits.
• Severe kidney or liver impairment calls for lower dosing or avoidance.
• Its long duration means that if you need a nitrate for chest pain in an emergency, doctors must wait much longer, often at least 48 hours, before giving it. Tell any emergency clinician that you took tadalafil.
• Combination with alpha-blockers needs special care, particularly with certain doses.

For a concrete example of how blood pressure drugs interact with this class, read Cialis and blood pressure medication. The full prescribing information for both products can be searched on DailyMed.

Verdict: No winner. This round is about matching the drug to your heart, liver, kidney and medicine list, and only a clinician can do that properly.

Round 6: Everyday fit

Spontaneity

Tadalafil’s long window means you are not racing the clock. Vardenafil requires a little more planning, although many couples find that planning is easy to live with.

Daily dosing

Low-dose daily tadalafil keeps a steady level in the blood, so there is no need to time a tablet around intimacy. It also treats BPH urinary symptoms at the same time, which is useful for men with both issues. Vardenafil is not used as a daily treatment. Our comparison of daily versus as-needed Cialis explains who tends to choose which.

Alcohol

Both drugs carry cautions about heavy drinking, which impairs erections and adds to blood pressure effects. The principles in our article on sildenafil and alcohol apply here too.

Cost and availability

Generic vardenafil and generic tadalafil are both available, and prices vary by pharmacy, plan and quantity. Because the Levitra brand is discontinued in the U.S., generic vardenafil is the standard. Compare cash prices and discount programs, and avoid unlicensed sellers; the FDA’s page on buying medicines over the internet explains the risks.

Predictability for a first-time user

Some men prefer the structure of a shorter-acting drug while they learn how their body responds. Others prefer tadalafil because the long window softens the pressure of timing. Either is reasonable.

The scorecard at a glance

Round	Edge	Why
1. Onset	Slight: vardenafil	More predictable within an hour
2. Duration	Tadalafil for flexibility; vardenafil for faster clearance	Up to 36 hours versus about 4 to 5 hours
3. Food	Tadalafil	Not meaningfully affected by meals
4. Side effects	Even	Similar profile; back and muscle aches lean tadalafil
5. Safety flags	Depends on your health	QT concerns for vardenafil; long window for tadalafil
6. Everyday fit	Tadalafil for spontaneity	Daily option, BPH benefit, flexible timing

Which patient profile fits which medicine?

The following matrix describes tendencies, not rules. Your prescriber’s judgment overrides any table.

If you…	You may lean toward	Notes
Want spontaneity and a long window	Tadalafil	As-needed or daily
Have urinary symptoms from BPH too	Tadalafil	Daily low dose is approved for both
Eat late or dine out often	Tadalafil	Less food sensitivity
Prefer a shorter, defined window	Vardenafil	Clears faster
Get back or muscle aches on tadalafil	Vardenafil	Aches are less typical
Have a heart rhythm condition or take antiarrhythmics	Usually avoid vardenafil; discuss with a cardiologist	QT considerations
Take certain HIV, antifungal or antibiotic drugs	Either, with dose limits	Interaction check essential
Take nitrates	Neither	Contraindicated

A plain-text decision path

Work through these questions in order. They are for preparing a conversation with your clinician, not for choosing a drug on your own.

1. Do you take any nitrate medicine, or use poppers? If yes, neither drug is safe. Talk to your doctor about other options.
2. Do you have a heart rhythm problem, a history of long QT, or take an antiarrhythmic? If yes, vardenafil is generally avoided, so tadalafil may be the better candidate. A cardiologist should weigh in.
3. Do you have urinary symptoms from an enlarged prostate? If yes, tadalafil may address both issues.
4. Do you want to avoid timing the tablet? If yes, tadalafil, as needed or daily, is likely to feel easier.
5. Do you prefer a shorter window and fewer lingering effects? If yes, vardenafil may suit you.
6. Did your first choice leave you with persistent side effects? Switching within the class is common; response to one does not predict response to another.

Three illustrative scenarios

The following composite examples are fictional and are meant only to show how the same two drugs can suit different lives. They are not medical advice.

The business traveler

A man in his late forties flies frequently, eats at irregular hours and rarely knows when an evening will be free. For him, a long window and relative indifference to food are the main attractions, so tadalafil as needed, or possibly a low daily dose, is the type of option his doctor might raise first. He would still need a check for blood pressure medicines and alpha-blockers.

The planner

A man in his fifties likes structure, eats early and has predictable evenings with his partner. A shorter-acting drug that clears within hours appeals to him, because he dislikes the idea of a drug lingering for days. Vardenafil is a natural candidate, provided his heart rhythm history and medicines are compatible.

The man with prostate symptoms

A man in his sixties has erectile difficulty and also gets up several times a night to urinate. A single daily low-dose tadalafil tablet is approved to address both, so his prescriber may suggest it. His doctor would first check his other medicines, since combining tadalafil with some alpha-blockers requires care.

What studies generally say about satisfaction and preference

Head-to-head and crossover studies of PDE5 inhibitors generally find that all of them improve erections in a majority of men, and that no single drug is best for everyone. When men try more than one, their preferences tend to split along practical lines: some favor the longer window and flexibility of tadalafil, while others prefer the quicker, more defined effect of shorter-acting drugs. Because expectations and conditions influence results, it is hard to draw a firm winner from any one trial. The best choice is often the one that fits your life, tolerates well and passes your doctor’s safety review.

Lifestyle changes that help either drug work better

Whichever medicine you take, it depends on healthy blood vessels and nerves. These habits support both:

• Regular aerobic exercise, which improves blood vessel function and is linked with better erectile function in several studies.
• A heart-healthy diet rich in vegetables, whole grains, fish and olive oil.
• Not smoking, since nicotine constricts blood vessels.
• Moderating alcohol, which interferes with both arousal and blood pressure.
• Treating sleep apnea, diabetes and high blood pressure, which are common but often undiagnosed contributors. The NIDDK’s erectile dysfunction page summarizes the connections.
• Managing stress and relationship communication, because anxiety undermines every PDE5 inhibitor.

Switching and trial periods

Men often have to try more than one option to find the best fit, and doctors usually expect that. Response is shaped by anxiety, food, alcohol and timing, so give each drug several well-prepared attempts before judging. The same troubleshooting list in why Viagra may not work the first time applies to any drug in this family. If you are comparing these with sildenafil, our guides to Cialis vs Viagra and Levitra vs sildenafil complete the three-way picture.

Do not switch by combining leftover tablets or adding a second drug to “boost” the first. Wait until the previous drug has cleared; because tadalafil lasts so long, your prescriber may advise waiting longer after tadalafil than after vardenafil before trying another medicine.

Practical tips on prescriptions, insurance and refills

Once you and your prescriber have chosen a drug, a few practical points make the experience smoother. Many insurance plans limit the number of ED tablets per month, so ask whether a larger or 90-day supply is allowed and whether prior authorization is needed. Compare cash prices at more than one licensed pharmacy, since generic prices for both vardenafil and tadalafil can differ widely, and ask about discount programs. If you use a telehealth service, make sure it is operated by licensed clinicians who ask about your medical history and current medicines before prescribing.

When a refill looks different, as generics often do between manufacturers, confirm with the pharmacist that the strength and drug name match your prescription. Keep the medicine in its original labeled container, away from heat and moisture, and out of reach of children. Finally, tell every clinician who treats you, including dentists and emergency staff, which ED medicine you use, because it affects which pain and heart medicines are safe to give.

Questions to bring to your appointment

• “Given my heart health and blood pressure medicines, is one of these safer for me?”
• “Do any of my other prescriptions interact with vardenafil or tadalafil?”
• “Would a daily low dose make sense, or should I take it as needed?”
• “How should I time it around meals and alcohol?”
• “What side effects should make me stop and call you?”
• “If this does not work after several attempts, what are the next steps?”

Frequently asked questions

Is Levitra stronger than Cialis?

Neither is “stronger” in a simple sense. Both are effective PDE5 inhibitors. They differ mainly in how long they last and how they interact with food and other conditions.

Which lasts longer, Levitra or Cialis?

Cialis lasts much longer, with a window of up to 36 hours, compared with about 4 to 5 hours for Levitra.

Which works faster?

Both usually work within roughly 30 to 60 minutes. Vardenafil is often described as slightly more predictable in that window, while tadalafil’s effect can build over a longer period.

Is Levitra still available?

The brand has been discontinued in the United States, but generic vardenafil, the same active ingredient, is available by prescription.

Which has fewer side effects?

The profiles are similar. Tadalafil is more associated with back and muscle aches, and vardenafil with heart-rhythm cautions in certain patients. Individual response varies.

Can I take Cialis and Levitra together?

No. Combining two drugs from the same class increases the risk of side effects and low blood pressure without reliable added benefit.

Which is better for diabetes?

Both are used in men with diabetes, who often respond less strongly to any PDE5 inhibitor. Choice depends on your overall health, and diabetes control matters as much as the drug.

Does food matter more for Levitra or Cialis?

Food matters more for vardenafil, where very fatty meals can delay and weaken the effect. Tadalafil is not meaningfully affected.

Can I take daily Levitra like daily Cialis?

No. Vardenafil is taken as needed, not as a daily low-dose regimen.

Do I need a prescription?

Yes. Both require a prescription in the United States, and a clinician should check your health and medicines first.

The bottom line

Levitra (vardenafil) and Cialis (tadalafil) are close cousins with different personalities. Vardenafil offers a defined window of a few hours and clears quickly. Tadalafil offers flexibility, a daily option and indifference to meals, with a longer tail of effect and side effects. Either can be the right choice depending on your schedule, other conditions and the medicines you already take.

The most useful step is not to pick a winner from a table, but to bring your medical history and daily habits to a clinician who can match them to a drug, a dose and a plan. If the first choice does not suit you, that is normal, not a failure, and there are good options to try next.

Medical disclaimer: This article is for general information only and is not medical advice. Always follow the guidance of your prescriber and pharmacist, and seek emergency care for serious symptoms.