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Lilly Cialis 20mg Tablets

£7.99

Pack Size: 4-Tablet Pack

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Lilly Cialis 20mg Tablets: Strong Erectile Dysfunction Treatment UK Guide

Lilly Cialis 20mg Tablets contain 20mg of tadalafil as the active ingredient and are a prescription medication used to treat erectile dysfunction (ED) in adult men. Tadalafil belongs to a group of medicines called phosphodiesterase type 5 (PDE5) inhibitors. Cialis is manufactured by Eli Lilly and Company Limited and is available in several strengths for the treatment of erectile dysfunction.

Tadalafil works by helping the blood vessels in the penis relax during sexual stimulation, increasing blood flow and supporting the development and maintenance of an erection suitable for sexual activity. Cialis does not cause an erection without sexual stimulation. The 20mg strength is generally considered when the recommended 10mg dose does not provide an adequate response and is tolerated appropriately.

What Is Cialis 20 mg Used For?

  • Erectile Dysfunction: Cialis 20mg is indicated for the treatment of erectile dysfunction in adult men who have difficulty achieving or maintaining an erection suitable for satisfactory sexual activity.
  • Difficulty Maintaining an Erection: Tadalafil can help improve the ability to maintain an erection during sexual stimulation, supporting sexual activity in men affected by erectile dysfunction.
  • Sexual Stimulation: Cialis does not work automatically or produce an erection without sexual stimulation. Sexual arousal is required for tadalafil to produce its erectile effect.
  • On-Demand Treatment: Cialis 20mg is intended for use before anticipated sexual activity rather than as continuous daily treatment. A lower daily tadalafil dose may be considered separately for men who require more frequent treatment.

How Does Cialis Work?

Cialis contains tadalafil, a PDE5 inhibitor that acts on the nitric oxide and cyclic GMP pathway involved in normal erectile function. During sexual stimulation, nitric oxide promotes the production of cyclic GMP in penile tissue. Tadalafil inhibits the PDE5 enzyme that breaks down cyclic GMP, helping maintain the blood flow needed for an erection.

Tadalafil has a relatively long terminal half-life of approximately 17.5 hours. In clinical studies, tadalafil improved erectile function and the ability to have successful sexual intercourse for up to 36 hours after dosing in appropriate patients. This does not mean that an erection lasts for 36 hours; rather, the medicine can provide an extended period during which an erection may occur in response to sexual stimulation.

How to Take Cialis 20 mg Tablets

  • Follow Your Prescription: Take Cialis exactly as prescribed by your doctor or healthcare professional. The 20mg strength is generally considered when 10mg tadalafil does not provide an adequate effect.
  • Before Sexual Activity: Cialis 20mg should be taken before anticipated sexual activity. It can be taken at least 30 minutes before sex.
  • Once-Daily Maximum: Do not take more than one dose of tadalafil in a 24-hour period. The 10mg and 20mg strengths are intended for use before anticipated sexual activity and are not recommended for continuous daily use.
  • With or Without Food: Cialis can be taken with or without food, so meals do not normally require a change to the timing of an on-demand dose.
  • Swallow the Tablet: Swallow the tablet whole with water. Do not alter the prescribed dose unless advised by your healthcare professional.
  • Dose Adjustment: Your doctor may adjust the tadalafil dose according to how well it works and how well you tolerate it. Men with certain kidney or liver problems may require different treatment decisions and should follow individual medical advice.

Cialis 20 mg Side Effects

Like all medications, Cialis can cause side effects, although not everyone experiences them.

  • Nausea
  • Headache
  • Flushing
  • Back pain
  • Dizziness
  • Diarrhoea
  • Indigestion
  • Muscle aches
  • Nasal congestion
  • Stomach discomfort

Some side effects may be more likely at higher doses. Serious reactions are uncommon, but urgent medical attention is required for symptoms such as chest pain, a severe allergic reaction, sudden vision loss, sudden hearing loss, or a prolonged or painful erection.

Important Warnings and Precautions

  • Nitrates: Do not take Cialis with organic nitrates, including nitrate medications used to treat angina, because tadalafil can significantly increase the blood-pressure-lowering effect of nitrates.
  • Riociguat: Cialis must not be used with riociguat or other guanylate cyclase stimulators because the combination can cause a significant reduction in blood pressure.
  • Heart Conditions: Men with cardiovascular disease should have their suitability for sexual activity and tadalafil treatment assessed by a healthcare professional. Cialis is contraindicated when sexual activity itself is considered inadvisable because of cardiac risk.
  • Blood Pressure: Tadalafil can lower blood pressure, particularly when combined with medicines that also reduce blood pressure. Tell your doctor about all medicines you take before treatment.
  • Kidney or Liver Problems: People with significant kidney or liver impairment may require different dosing or may not be suitable for higher-dose tadalafil. Medical assessment is important before using Cialis 20mg in these circumstances.
  • Vision Problems: Rarely, PDE5 inhibitors have been associated with serious visual problems. Seek urgent medical attention if you experience sudden loss of vision.
  • Other Medicines: Tell your doctor or pharmacist about other prescription medicines, over-the-counter medications and recreational drugs before taking Cialis, particularly medicines that affect blood pressure or the cardiovascular system.
  • Alcohol: Drinking large amounts of alcohol can temporarily reduce the ability to obtain an erection and may increase the risk of dizziness or low blood pressure when combined with tadalafil.

Stopping Cialis Treatment

Cialis 20mg is generally used on demand for erectile dysfunction, so it does not normally require gradual dose reduction when treatment is stopped. If you are taking tadalafil regularly or have been instructed to continue treatment for another condition, follow your prescriber’s advice rather than changing the dose yourself. If erectile difficulties continue, medical assessment can help identify underlying conditions such as cardiovascular disease, diabetes or other health problems.

Frequently Asked Questions

How long does Cialis 20 mg take to work?

Cialis can be taken at least 30 minutes before anticipated sexual activity. Sexual stimulation is still required, and tadalafil does not produce an automatic erection.

How long does Cialis 20 mg last?

Tadalafil has a terminal half-life of approximately 17.5 hours and can support erectile function for up to 36 hours after a dose in appropriate patients. This means there is an extended treatment window, not that an erection should last for 36 hours.

Can I take Cialis 20 mg every day?

The 10mg and 20mg Cialis strengths are intended for use before anticipated sexual activity and are not recommended for continuous daily use. Men who require treatment more frequently may be considered for a lower once-daily tadalafil regimen by their doctor.

Can I take Cialis 20 mg with food?

Yes. Cialis can be taken with or without food, so it can generally be taken around mealtimes without changing the prescribed dose.

Can I take Cialis 20 mg with Viagra or other erectile dysfunction medication?

You should not combine Cialis with other PDE5 inhibitors or other erectile dysfunction treatments unless specifically instructed by a healthcare professional. Combining treatments can increase the risk of adverse effects, including low blood pressure.

Can I take Cialis 20 mg with nitrates?

No. Cialis must not be taken with organic nitrates because tadalafil can substantially increase the blood-pressure-lowering effect of these medicines. This includes nitrate treatments used for angina such as glyceryl trinitrate (GTN).

Disclaimer:

This content is provided for informational purposes only and does not constitute medical advice. These medications are prescription-only medicines (POM) in the UK and should only be used under the guidance and supervision of a qualified healthcare professional.

Medically Reviewed By

Medically Reviewed By

Speciality: Medical Content Reviewer

Last Reviewed: April, 2026

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