Tadalafil

Tadalafil UK: Side Effects, Dosage Guide, 5mg, 10mg & 20mg Explained

Tadalafil is a PDE5 inhibitor used to treat erectile dysfunction (ED) and benign prostatic hyperplasia (BPH) in adult men. It is the active ingredient found in Cialis tablets and in generic tadalafil products such as Vidalista.

Among all erectile dysfunction medicines, tadalafil is best known for its exceptionally long duration of action. Unlike sildenafil-based treatments that usually last 4 to 6 hours, tadalafil tablets can remain effective for up to 36 hours, earning the medicine the nickname “the weekend pill.”

This guide explains everything UK patients need to know about tadalafil, including:

• Tadalafil dosage (5mg, 10mg & 20mg)
• Tadalafil side effects
• Daily tadalafil treatment
• Drug interactions and safety
• Differences between tadalafil and sildenafil

Information in this guide is consistent with current UK prescribing guidance and MHRA-approved clinical use.

What is Tadalafil?

Tadalafil belongs to a class of medicines known as phosphodiesterase type 5 (PDE5) inhibitors. It was originally developed by Eli Lilly under the brand name Cialis, and is now widely available in the UK as generic tadalafil tablets.

Tadalafil is licensed in the UK for:

• Erectile dysfunction (ED)
• Benign prostatic hyperplasia (BPH)
• Pulmonary arterial hypertension (under separate formulations)

Unlike many other erectile dysfunction tablets, tadalafil offers both:

• On-demand dosing (10mg & 20mg)
• Daily low-dose treatment (2.5mg & 5mg)

Because of its flexibility and long-lasting effect, tadalafil is one of the most widely prescribed ED medicines in the UK.

How Does Tadalafil Work?

Tadalafil works by inhibiting the PDE5 enzyme, which regulates blood flow in penile tissue and the prostate.

During sexual stimulation, nitric oxide triggers the production of cGMP — a chemical that relaxes blood vessels and increases blood flow. In men with erectile dysfunction, PDE5 breaks down cGMP too quickly, preventing a satisfactory erection.

Tadalafil blocks PDE5, allowing cGMP to accumulate and improving erectile function naturally.

The process works as follows:

• Sexual stimulation releases nitric oxide
• cGMP relaxes penile blood vessels
• PDE5 normally breaks down cGMP
• Tadalafil inhibits PDE5
• Blood flow improves and erection becomes possible

The key advantage of tadalafil is its long plasma half-life of approximately 17.5 hours, which allows effectiveness for up to 36 hours after dosing.

Tadalafil Dosage Guide 5mg, 10mg & 20mg

The correct tadalafil dosage depends on whether treatment is being used daily or on-demand.

Standard tadalafil doses include:

• Tadalafil 5mg – daily erectile dysfunction and BPH treatment
• Tadalafil 10mg – standard starting dose for on-demand ED use
• Tadalafil 20mg – maximum licensed on-demand ED dose

For on-demand erectile dysfunction treatment:

• Take tadalafil 10mg at least 30 minutes before sexual activity
• Increase to tadalafil 20mg if the response is insufficient
• Reduce to 5mg if side effects occur

For daily use:

• Tadalafil 5mg is taken once daily at the same time each day
• Provides continuous erectile support without planning around dosing

Unlike sildenafil, tadalafil can be taken with or without food because meals do not significantly affect absorption.

Tadalafil 5mg for Daily Use Explained

Tadalafil 5mg is the MHRA-approved dose for daily erectile dysfunction treatment and for benign prostatic hyperplasia.

One of the biggest advantages of tadalafil 5mg daily is spontaneity. Instead of timing medication around sexual activity, users maintain a continuous therapeutic tadalafil level.

Benefits of tadalafil 5mg daily include:

• Continuous erectile support
• Greater spontaneity
• No need to schedule dosing before sex
• Improvement in urinary symptoms linked to BPH

Tadalafil 5mg is also one of the most prescribed daily tadalafil tablets in the UK, particularly for men who are sexually active multiple times per week.

Tadalafil 10mg | Standard Starting Dose

Tadalafil 10mg is the recommended starting dose for most men using tadalafil on-demand.

It is generally suitable for:

• Mild to moderate erectile dysfunction
• First-time PDE5 inhibitor users
• Men seeking long-lasting erectile support

Important points:

• Take at least 30 minutes before sexual activity
• Effective for up to 36 hours
• Do not exceed one dose in 24 hours

Unlike sildenafil, tadalafil 10mg is not significantly affected by high-fat meals, making it more flexible and convenient for many users.

Complete List of

Tadalafil Side Effects

Tadalafil side effects are well documented through clinical studies and post-marketing surveillance. Most are mild, temporary, and dose-dependent. Common tadalafil side effects include:

• Headache
• Facial flushing
• Indigestion
• Nasal congestion
• Back pain
• Muscle aches (myalgia)

Back pain and muscle aches are more characteristic of tadalafil compared with sildenafil because tadalafil also mildly inhibits the PDE11 enzyme in skeletal muscle. Most side effects resolve within 24 to 48 hours without treatment.

Serious tadalafil side effects requiring urgent medical attention:

• Priapism (erection lasting more than 4 hours)
• Sudden vision loss
• Sudden hearing loss or tinnitus
• Severe chest pain or hypotension
• Allergic reactions involving swelling or breathing difficulty

Side effects are generally milder at tadalafil 5mg daily compared with tadalafil 20mg on-demand.

Key Differences for

Tadalafil vs Sildenafil

Tadalafil and sildenafil are both PDE5 inhibitors, but they differ significantly in duration, flexibility, and daily dosing options.

Tadalafil (Cialis / Vidalista)

• Lasts up to 36 hours
• Available as daily 5mg treatment
• Food has minimal effect
• Better for spontaneity and frequent sexual activity

Sildenafil (Viagra / Cenforce / Kamagra)

• Lasts 4–6 hours
• No licensed daily ED dose
• High-fat meals delay absorption
• Better for shorter planned activity

For men looking for a long-lasting erectile dysfunction tablet, tadalafil is often the preferred option.

Tadalafil Drug Interactions

The most important tadalafil interaction is with nitrate medications, which can cause a dangerous drop in blood pressure.

Never combine tadalafil with:

• GTN spray
• Isosorbide mononitrate
• Recreational nitrites (poppers)

Use caution with:

• Alpha-blockers
• HIV medications
• Ketoconazole or erythromycin
• Excessive alcohol consumption

These may increase tadalafil levels or worsen side effects.

Who Should Not Take Tadalafil?

Tadalafil is not suitable for everyone and should be avoided in specific medical situations.

Do not take tadalafil if:

• You use nitrate medications
• You have unstable cardiovascular disease
• You have had a recent heart attack or stroke
• You have severe liver impairment
• You are under 18 years old

Dose adjustments may also be required in kidney disease or mild-to-moderate liver impairment.

Frequently Asked Questions  for Tadalafil UK

What is the correct tadalafil dosage?

The standard starting dose for erectile dysfunction is tadalafil 10mg on-demand. Tadalafil 5mg is used daily, while tadalafil 20mg is the maximum licensed dose.

What are the side effects of tadalafil?

The most common tadalafil side effects are headache, flushing, indigestion, nasal congestion, back pain, and muscle aches.

What is tadalafil 5mg used for?

Tadalafil 5mg is used for daily erectile dysfunction treatment and benign prostatic hyperplasia (BPH).

What is tadalafil 10mg used for?

Tadalafil 10mg is the standard starting dose for on-demand erectile dysfunction treatment and remains effective for up to 36 hours.

How long do tadalafil side effects last?

Most tadalafil side effects resolve within several hours, although back pain and muscle aches may last up to 48 hours due to tadalafil’s long half-life.

Disclaimer

This content is for informational purposes only and does not constitute medical advice. Tadalafil is a prescription-only medicine in the UK and should only be used under guidance from a qualified healthcare professional.