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How Long Does Cialis Last? Everything You Need to Know

By Erica Wilson, Aug-20-2026  

How Long Does Cialis Last? Everything You Need to Know
Written By-Erica Wilson  Medical Senior Writer
 • Published: 08/20/2026
• Updated: 06/25/2026

🏷️ Key Facts:

Cialis is a branded PDE5 inhibitor containing Tadalafil in it. Available in multiple dosages, 40 mg is the highest approved dose of it by the TGA. The drug is available in different forms like hard tablet (both brand and generics), Chewable 20 Mg form (generic) and oral jelly (generic).

It is a highly effective drug to treat ED (erectile dysfunction), an impotency in males where they cannot find erection during sex. The drug gives you an erection within 30 minutes when sexually stimulated and the erection remains for 4-6 hours, giving you a window of 36 hours for the erection.

Coming to your query regarding the lasting effect of Cialis, there are multiple things that govern the same. Therefore, you will have to know a bit more about the drug to understand its lasting effect of it.

Important Things To Know About Cialis:

You have come across the ingredients and the pharmacokinetics of the drug, but some other things must also be known to you for understanding the Tadalafil effect.

How Does Cialis Work?

Cialis works in you in three steps:

  1. Inhibits PDE5 enzyme: The first thing tadalafil does is it inhibits the PDE5 enzyme in you that restricts blood flow and stiffens the blood vessels as well as the pelvic muscles. As the PDE5 enzyme is inhibited, several things are unlocked in your system to give you an erection.
  2. Eases Blood Flow: As PDE5 is inhibited, cGMP breakdown stops and that increases blood flow. Hence, when you are stimulated, blood can flow to the penis tip, giving you a hard erection.
  3. Softens Blood Vessels: Not only hard erection, but sexual desire also unlocks Nitric Oxide flow, which is facilitated with PDE5 inhibition. This relaxes your blood vessels and pelvic muscles to keep you erect for a longer period.

How To Increase Blood Flow To The Penis Naturally

Warnings Related To The Use Of Cialis:

Here are some of the practices you must not do to avoid side effects and get the best effect from Cialis:

  • Take other drugs carefully: Nitrates must be totally avoided. Blood pressure reducing agents like antihypertensives, blood thinners and alpha-blockers must be controlled. CYP3A4 inhibitors must be censored as they may overdose on Tadalafil.
  • Consider Preexisting illnesses: Never take Cialis with severe heart issues to avoid heart attacks. In case you have severe liver, renal or retinal issues, consult your doctor before fixing the right dose of Cialis.
  • Be careful about critical side effects: In case you face critical side effects, like chest pain, temporary hearing impairment or blindness, and priapism, meet your doctor soon.
  • Never to do practices: Never take alcohol with Tadalafil. Men below 18 years old must not take Tadalafil. Never drive a car with Cialis.

Factors Governing How Long Cialis Lasts:

Considering the above details, let us now note down the general and critical factors that govern how much time Cialis lasts:

General Details Of Cialis Tenure:

  • Onset timing: The general onset timing for Cialis is 30 minutes. The timing remains the same in the case of Cialis Chewable 20 Mg and Cialis oral jelly, too, as Tadalafil does not interact with food that much.
  • Peak Time: After the absorption, Tadalafil takes no time to inhibit PDE5 and hence, peak time is attained sooner. It is the longest-lasting PDE5 inhibitor that has a half-life of nearly 17 hours.
  • Clearance: In normal cases, Tadalafil lasts in your blood for 36 hours, after which it is gradually cleared.

Influencing Factors:

  • Heavy Doses: Although 20mg is the highest dose approved by the TGA, the WHO-GMP licensed companies develop Cialis 40 mg and Cialis 60 mg, too. These are high doses and they remain in the blood even after 36 hours. For example, reportedly, the 60 mg drug’s effect even remains feebly in the system after 48 hours.
  • CYP3A4 inhibitors: There are some antibiotics (erythromycin), antifungals (itraconazole) and HIV protease inhibitors (ritonavir) which double the dose of Tadalafil. Thus, 20 mg will be converted to 40 mg and therefore, the clearance time is also increased, making the drug last in your system for a longer time.
  • CYP3A4 inducers: Drugs like Riociguat reduce the dose of Tadalafil to half. This means that a 60 mg tablet will be converted to 30 mg. Therefore, while 60 mg Cialis lasts even after 36 hours, taking it with a CYP3A4 inducer will reduce the lasting time of the drug.

Critical Conditions With Cialis Lasting:

  • Priapism: Although the drug remains in your system for 36 hours or, in special cases, even more, staying erect constantly for more than 4 hours is not a good indication. Often, those erections are painful, and they involve blood coagulation in the penile blood vessels, causing a disorder called Priapism. Therefore, in such cases, see a doctor immediately as it is not a regular incidence for any man.
  • Not getting an erection: Most of the time, the doctor suggests patients to start regular intake of Cialis with 10mg or even 5 mg. However, it can so happen that you are not getting a strong erection with those doses, or the erection is not lasting for a longer time. In such cases, meet your doctor and tell him the details. He might increase the dose for a better lasting effect.

A Guide To Cialis Side Effects And Precautions

The Final Verdict: How To Get The Maximum From Cialis?

Considering all the details stated above, you can now come across to an understanding about Generic Cialis. It is a great drug to give you a long-lasting erection, even though you have ED. It is also available in multiple forms, and hence you will have to face no difficulty taking it. You just have to take care about the other drugs you are taking to confirm that you get the best result from Tadalafil. So, consider taking all your medical reports to your doctors at the time of treatment to get the right suggestion.

FAQ

How to take Cialis?

Take Cialis hard tablet with water. Chewable and oral jelly can be consumed without water.

Can I take food with Cialis?

Yes, Cialis interacts less with food. So, you can take it with or without food.

How long does Cialis take to give me an erection?

Cialis takes 30 minutes to give you an erection, condition provided that you have the sexual desire.

Can Cialis be taken with alcohol?

No, taking Cialis with alcohol can cause severe hypotension.

Can I drive a car after taking Cialis?

No, driving a car with Cialis can be dangerous due to the dizziness caused by the drug.

Where to buy Cialis in Australia?

You can buy Cialis in Australia from AustraliaRXMeds, which is a trusted online pharmacy with the best stock of generic medicines.

Erica Wilson (Medical Senior Writer)

Years of Experience: 10+ years Education: B.Sc. in Biomedical Science (Monash University, Melbourne, Australia) PG Diploma in Health & Medical Communication (University of Sydney, Australia) Experience: Erica Wilson is an…

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