Erectile Dysfunction

Tadalafil (Generic Cialis)

Up to 36 hours of readiness, at the strength that fits you.

Tadalafil is an FDA-approved PDE5 inhibitor that increases blood flow to support an erection during arousal. A single dose, 10mg or 20mg, stays active for up to 36 hours, giving you a wider window than same-day options.

Oral tablet10 / 20 mg

Strength

Doses per month

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Cadence

Tadalafil 10mg - 10 Doses/Month Monthly Plan - 10 doses/mo$71 billed monthly

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How it works

How Tadalafil (Generic Cialis) works

Tadalafil works by blocking an enzyme called PDE5, which allows blood vessels in the penis to relax and fill with blood. Its long half-life, about 17.5 hours, is what gives it a window of up to 36 hours instead of just a few. Like all PDE5 inhibitors, it only works with sexual arousal; it does not cause spontaneous erections. The mechanism and window are identical at 10mg and 20mg. 20mg is the maximum as-needed dose, prescribed for people who need a stronger response than 10mg provides. Choose your strength at checkout.

What to expect

Timeline & results

Tadalafil generally starts working within 30 to 60 minutes and reaches peak effect around 2 hours, then stays active for up to 36 hours, whether you're taking 10mg or 20mg. Unlike sildenafil, its absorption isn't affected by food, so timing a meal around your dose doesn't change how it works. Dose-response data confirms no additional benefit above 20mg, the highest as-needed strength.

Getting started

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Key benefits

What Tadalafil (Generic Cialis) is used for

Up to 36 hours of effectiveness from a single dose, at either strength.

Works with meals, no timing your food around it.

Flexible enough to plan for a whole weekend.

20mg available for people who need a stronger response than 10mg provides, with no benefit past it.

FDA-approved with dose-response confirmed since 2003.

Safety information

Important safety information

Tadalafil requires sexual arousal to work; it does not cause spontaneous erections. Never take tadalafil with nitrate medications or alpha-blockers. Combining either with tadalafil can cause a dangerous drop in blood pressure. Reported side effects include headache, flushing, indigestion, back pain, muscle aches, and nasal congestion. Talk to your provider before starting if you have cardiovascular disease, uncontrolled high blood pressure, or liver or kidney problems.

This page is educational and is not medical advice. Tell your provider about your full medical history and current medications before starting treatment.

About

About Tadalafil (Generic Cialis)

Tadalafil is a phosphodiesterase type 5 (PDE5) inhibitor that works by relaxing the smooth muscle in penile blood vessels, allowing increased blood flow in response to sexual stimulation. By blocking the PDE5 enzyme, tadalafil prevents the breakdown of cyclic GMP (cGMP), a signaling molecule that promotes vasodilation. Importantly, tadalafil does not produce an erection on its own. Sexual arousal is required for the mechanism to take effect.

Tadalafil as-needed is typically taken 30 minutes to 2 hours before anticipated sexual activity. The 10 mg dose is commonly the starting point, with the option to adjust to 20 mg based on a provider's assessment of efficacy and tolerability. Its distinguishing characteristic is a half-life of approximately 17.5 hours, which translates to a therapeutic window of up to 36 hours, earning it the informal label "the weekend pill."

Most individuals notice the onset of effect within 30 to 60 minutes of taking a dose, though timing can vary with food intake and individual metabolism. The extended duration means there is no need to time the dose precisely around sexual activity, which many patients find meaningfully reduces performance-related anxiety.

Tadalafil may be a good fit for men who want flexibility in timing, engage in sexual activity more than once in a given window, or have found shorter-acting PDE5 inhibitors less convenient. It is available as a compounded tablet through a licensed pharmacy after a licensed provider reviews your health history and determines it is appropriate for you.

Common side effects include headache, flushing, nasal congestion, indigestion, and back pain. Tadalafil must not be combined with nitrate medications (such as nitroglycerin) or guanylate cyclase stimulators, as the combination can cause a severe, potentially dangerous drop in blood pressure. Patients with cardiovascular disease, hypotension, or severe hepatic or renal impairment should discuss their full medical history with a provider before use.

FAQ

Frequently asked questions

Should I choose 10mg or 20mg tadalafil?+

10mg is the standard starting dose and works well for most first-time users, while 20mg is the maximum as-needed strength for those who need a stronger response. Both share the same up-to-36-hour window and food-independent dosing. Choose your strength at checkout, and your provider will confirm or adjust it based on how you respond.

How long does tadalafil last?+

A single dose of tadalafil, 10mg or 20mg, stays effective for up to 36 hours, far longer than same-day ED medications. It typically starts working within 30 to 60 minutes and reaches peak effect around the 2-hour mark. That long window is why tadalafil is sometimes called the "weekend pill," since one dose can cover more than a day.

Why is tadalafil called the weekend pill?+

Tadalafil earned the nickname because a single dose lasts up to 36 hours, roughly a full weekend, instead of the 4-to-6-hour window of shorter-acting options. Its long half-life of about 17.5 hours means it stays in your system without requiring you to plan sex around a specific dosing time.

Can I take tadalafil with food?+

Yes, tadalafil can be taken with or without food, and unlike some other ED medications, meals don't delay how it's absorbed. This makes timing more flexible since you don't have to plan your dose around eating. It still requires sexual arousal to take effect.

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