Cialis 20 mg is taken before sexual intercourse and works by inhibiting PDE5 to improve blood flow to the penis.

Cialis 20mg: what is its effect?

Notre équipe éditoriale

Medically reviewed by Notre équipe éditoriale

Written by Anne-Sophie Laignel

Last updated 1/7/2025 - 5 min read

The mechanism of action of Cialis 20 mg

Cialis 20 mg works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which is responsible for the breakdown of cyclic guanosine monophosphate (cGMP). The latter is a key molecule in the physiological process of erection. When a man is sexually stimulated, the body releases nitric oxide, which increases the production of cGMP in the penis. cGMP causes the smooth muscles in the penile arteries to relax, allowing blood to flow more easily, leading to an erection.

However, PDE5 reduces the amount of cGMP in the penis, thus preventing a sustained erection. By inhibiting this enzyme, Cialis helps to maintain higher levels of cGMP in the penis, thereby facilitating an erection when sexual arousal occurs. Like other PDE5 inhibitors, Cialis does not cause an erection automatically, but enhances the body's response to sexual stimulation.

Get a Cialis Prescription

The dosage and frequency of administration of Cialis 20 mg

Cialis 20 mg is often prescribed to men who have occasional or less frequent sexual intercourse, as this dosage is more concentrated and can last longer. It is generally recommended to take Cialis 20 mg about 30 to 60 minutes before planned sexual activity. The medication starts to work quickly, and the maximum effect is reached approximately 2 hours after ingestion.

This medication is not intended for daily use, unlike Cialis 5 mg, which can be taken every day to maintain a constant erectile function. Cialis 20 mg is taken as needed, meaning it is only used when the man anticipates sexual activity. It can be taken with or without food, although absorption may be slightly slower if the medication is taken after a meal high in fat.

It is important to adhere to the prescribed dosage, as taking more than 20 mg at once does not enhance the medication's effect and increases the risk of side effects. If in doubt about the dosage, it is essential to consult a healthcare professional.

The duration of effect of Cialis 20 mg

One of the main advantages of Cialis 20 mg compared to other PDE5 inhibitors, such as Viagra, is its extended duration of action. After a single dose, Cialis remains effective for about 24 to 36 hours. This allows men great flexibility, as the erection does not depend on as narrow a time window as that of other medications.

The extended duration of action makes Cialis a drug of choice for men who prefer a degree of spontaneity in their sexual encounters, as it allows for an erection to occur at any time within this 24 to 36-hour period, under the influence of sexual stimulation. This 'window of effectiveness' is much longer than that of other erectile dysfunction medications, which often have effects limited to just a few hours.

However, it is important to note that although the medication is active for an extended period, this does not mean that an erection lasts for this entire time. An erection will only occur when the man is sexually stimulated, and it will subside once the excitement is over. This reduces the risk of priapism (prolonged and painful erection), a side effect that can occur with some other erectile dysfunction medications.

Possible side effects of Cialis 20 mg

Cialis 20 mg is generally well tolerated, but like any medication, it can cause side effects. The most common adverse effects are similar to those observed with other PDE5 inhibitors and include headaches, hot flashes, muscle pain, and digestive issues such as indigestion. These side effects are usually temporary and disappear after a few hours.

More serious side effects, although rare, can occur. This includes severe allergic reactions, chest pain, dizziness, visual disturbances, or prolonged pain in muscles and joints. In very rare cases, Cialis can cause a prolonged erection (priapism), which requires immediate medical attention.

Cialis should not be taken with medications containing nitrates, often prescribed for chest pain, as this combination can cause a significant drop in blood pressure, which can be dangerous. Additionally, Cialis can interact with other medications, including certain blood pressure drugs, so it is essential to consult a doctor before starting treatment to ensure it is safe.

Cialis 20 mg is an effective treatment for erectile dysfunction, offering extended action from 24 to 36 hours. This allows men greater flexibility and more freedom in planning their sexual activities. By inhibiting the PDE5 enzyme, it improves blood flow to the penis and thus facilitates an erection in response to sexual stimulation. As with any medication, it is important to use it under the supervision of a healthcare professional to avoid the risk of side effects and ensure optimal effectiveness.

Evaluate Your Erectile Function in 2 Minutes

The IIEF-5 Index is a recognized tool to assess erectile function. Answer 5 questions and discover your score and options in complete confidentiality.

IIEF-5

Over the last six months

How do you rate your confidence that you could get and keep an erection?

Very low

Low

Moderate

High

Very high

Need to consult a specialist doctor in sexual health?
  • Quick medical consultation in less than 24h.
  • Discreet teleconsultation: the doctor contacts you only if necessary.
  • Affordable rate: €35, for healthcare accessible to everyone.
  • Prescription in 3h if you are eligible for treatment.
  • Treatment delivered to your home by our partner pharmacies.

ARTICLES DE BLOG

À voir aussi

Thanks to its asynchronous approach and video consultations for more serious needs, Kano helps to relieve hospital services while ensuring effective medical follow-up.

Kano.care: a solution to the medical desert in Lille?

Finding a urologist quickly has become impossible in Lille! The shortage of urologists in Lille is a worrying reality that affects many patients facing excessive waiting times for specialized consultations. According to available data, the average waiting time to get an appointment with a urologist in the Lille region often exceeds eight months, an untenable situation for patients needing a treatment renewal or a rapid diagnosis, especially in cases of erectile dysfunction.

In case of suspicion of a more serious problem, a videoconference consultation with a specialist is organized to ensure appropriate medical follow-up.

How is Kano fighting the shortage of urologists in Marseille

The city of Marseille, despite being equipped with several renowned hospital facilities, is facing a critical shortage of urologists. With waiting times often exceeding eight months for a hospital consultation, patients suffering from urological disorders, particularly erectile dysfunction, find themselves in a difficult situation. Kano.care, by revolutionizing access to urological care through asynchronous teleconsultation, offers an effective and immediate alternative to the saturated physical consultations.

By relieving the burden of in-person consultations, Kano.care enables urologists to focus on complex cases, while ensuring quick access to care for patients.

How is Kano tackling the shortage of urologists in Bordeaux?

The shortage of urology specialists is a major problem in Bordeaux, as in many regions of France. Patients dealing with sexual function disorders, such as erectile dysfunction, often have to wait more than eight months to get an appointment for an in-person consultation. This excessive delay is unacceptable, especially for patients in need of a treatment renewal or a rapid diagnosis. It is in this context that Kano.care positions itself as an effective and modern alternative, allowing for quick, discreet, and high-quality care.

Ordoclic and Kano.care: a collaboration for convenient and reliable digital prescriptions.

Ordoclic: The Reference Partner for Digital Prescriptions from Kano.care

In a world where digital health is becoming increasingly important, choosing reliable and innovative partners is essential. For Kano.care, a leader in teleconsultation specializing in men's intimate health, the goal is clear: to offer its patients a smooth, secure, and effective experience. It is with this in mind that Kano.care has selected Ordoclic as a partner for the management of digital prescriptions. A strategic choice that improves the daily lives of patients while ensuring maximum security.

Kano Care's initiatives have already shown promising results in Lyon. Waiting times for urological consultations have decreased thanks to teleconsultations. Patients, especially in outlying areas, benefit from better follow-up. By combining technological innovation and recruitment efforts, Kano Care is building a sustainable solution to the shortage of specialists. This approach could serve as a model for other regions facing similar challenges.

How is Kano combating the shortage of urologists in Lyon?

The shortage of urologists is an increasing problem in many French regions, including Lyon, where access to specialized consultations is becoming increasingly difficult. In response to this challenge, Kano Care, an innovative healthcare company, offers concrete solutions to address this shortage. By combining advanced technologies, personalized services, and efficient organization, Kano Care aims to optimize access to urological care for patients in the Lyon area.

Kano.care is transforming access to men's healthcare by offering a digital solution that combines speed, safety, and discretion. Addressing specific needs such as erectile dysfunction, hair loss, or hormonal disorders, Kano.care simplifies medical consultations for men who value both convenience and privacy. The platform allows users to fill out an online medical questionnaire, which assists doctors in understanding their symptoms and making a quick diagnosis. Thanks to an online consultation that's just a few clicks away, patients can avoid the hassle of a physical appointment and receive an electronic prescription in less than 24 hours, if the treatment is appropriate.

How does Kano ensure quick access to reliable and secure medical consultations?

Kano.care is transforming access to men's healthcare by offering quick and secure online consultations. With a user-friendly platform, men can consult a doctor without the need for an in-person appointment and, if necessary, receive an electronic prescription in less than 24 hours. Kano.care ensures data confidentiality through advanced encryption protocols and collaborates with certified healthcare professionals. This solution eliminates the risks associated with counterfeit products and offers a reliable alternative to traditional consultations, meeting user expectations in terms of discretion and convenience.

REAL IMPACT

They Trust Us

Mick

39 years old

Super

Received the prescription in under 2 hours 👍🏼

Adriano

36 years old

Very satisfied

Quick, reliable. Perfect.

Philipe

53 years old

Simple and effective

Simple and effective, nothing more to say. Great for a first experience.

Treatments for erectile dysfunction, such as Viagra®, Cialis®, Levitra®, and Spedra®, carry potential risks that vary depending on the patient's health condition. They may cause serious side effects, including cardiovascular issues, dangerous drug interactions, or prolonged erections (priapism), which require immediate medical attention. It is essential never to take these medications without the advice of a qualified healthcare professional. A thorough medical consultation is necessary to determine the appropriate treatment for each individual, taking into account medical history and contraindications. Additionally, it is crucial to ensure that the medications are obtained from reliable and authorized sources. Medications purchased outside legal channels or without a prescription may be counterfeit, ineffective, or even harmful to health. Always consult a doctor before using these treatments and obtain medications from a licensed pharmacy.

iphone-consultation

Erectile dysfunction?

  • 100% online consultation
  • No appointment needed, prescription within 3 hours
  • Fast and discreet delivery
trustpilot

Rated as 'Excellent' on Trustpilot.

Thousands of men already trust us.

Erectile dysfunction?

  • 100% online consultation
  • No appointment needed, prescription within 3 hours
  • Fast and discreet delivery
iphone-consultation
trustpilot

Rated as 'Excellent' on Trustpilot.