Tadalafil in the UK: How to Get It Safely Online

Tadalafil is the UK's second most prescribed treatment for erectile dysfunction and the active ingredient in Cialis. Its 36-hour duration, independence from food, and availability as a once-daily low dose make it the most distinctive and versatile ED medication available. This guide covers how tadalafil works, how to get it in the UK, dosage, side effects, and contraindications. For a head-to-head comparison with sildenafil, see: Tadalafil vs Sildenafil. For a comparison of all four MHRA-approved ED medications, see: Viagra vs Cialis vs Levitra vs Stendra.

What Is Tadalafil?

Tadalafil is an MHRA-approved phosphodiesterase type 5 (PDE5) inhibitor, the same class of drug as sildenafil (Viagra), vardenafil (Levitra), and avanafil (Spedra). Tadalafil was originally licensed under the brand name Cialis, manufactured by Lilly. Since the patent expired, generic tadalafil has been widely available in the UK at significantly lower cost.

Unlike sildenafil, which lasts 4–6 hours and is affected by food, tadalafil lasts up to 36 hours and is completely unaffected by food or alcohol timing. This longer window gives it a very different profile of use — and makes it the preferred choice for men who want a more spontaneous sexual experience.

Tadalafil is also the only ED medication with a dual licence: it is approved for both erectile dysfunction and benign prostatic hyperplasia (BPH), making it the medication of choice for men with both conditions.

How Does Tadalafil Work?

During sexual stimulation, nerves in the penis release nitric oxide, which triggers production of cyclic GMP (cGMP). cGMP relaxes the smooth muscle lining penile arteries, allowing blood to flow in and produce an erection. The enzyme PDE5 normally breaks cGMP down — tadalafil blocks PDE5, allowing cGMP to persist longer and making erections significantly easier to achieve.

Sexual stimulation is still required. Tadalafil does not cause an automatic erection — it enhances the body's natural erectile response when arousal is present.

Tadalafil Dosage in the UK

Tadalafil for ED is available in two on-demand doses and one daily dose. The choice depends on your lifestyle, frequency of sexual activity, and tolerability.

Never take more than one on-demand dose in a 24-hour period. Older men or those with kidney or liver impairment should start at 5mg on-demand and increase only under prescriber guidance.

Unlike sildenafil, tadalafil does not need to be taken on an empty stomach — it can be taken with or without food, and the timing of a meal has no effect on absorption.

How to Get Tadalafil in the UK

Tadalafil is a prescription-only medicine (POM) in all doses in the UK. Unlike sildenafil 50mg (Viagra Connect), there is no over-the-counter tadalafil available — a prescriber consultation is required for all doses.

NHS Tadalafil: What You Need to Know

NHS prescribing of tadalafil follows the same criteria as sildenafil: it is available on the NHS for men with ED associated with diabetes, multiple sclerosis, Parkinson's disease, prostate cancer, renal failure requiring dialysis, spinal cord injury, or severe pelvic injury, and where ED causes severe distress. Men who do not meet these criteria may be directed to private purchase.

Getting Tadalafil Online from a Registered Pharmacy

Access Doctor's GPhC-registered pharmacist independent prescribers can assess your suitability for tadalafil via a confidential online consultation — no GP appointment required. The process takes around 5 minutes. If appropriate, a prescription is issued and your medication is dispatched in plain, unmarked packaging, typically arriving next working day.

Always verify that an online pharmacy is registered with the GPhC at pharmacyregulation.org before purchasing any prescription medication. See: Why Kamagra Is Dangerous for the risks of unregulated online suppliers.

Side Effects of Tadalafil

Tadalafil's side effect profile overlaps significantly with sildenafil, since both are PDE5 inhibitors. However, its longer half-life means side effects, when they occur, can persist for longer — though they remain mild for most men.

Common (may affect up to 1 in 10 people)

• Headache — the most frequently reported side effect; caused by cerebral vasodilation
• Facial flushing — warmth and redness, usually mild and transient
• Nasal congestion or rhinorrhoea — temporary; generally less frequent than with sildenafil
• Indigestion (dyspepsia) — particularly if taken close to a meal
• Back pain and muscle aches (myalgia) — more commonly reported with tadalafil than other PDE5 inhibitors, due to its long systemic presence. Usually resolves within 48 hours.
• Dizziness — blood-pressure-lowering effect; avoid standing quickly

Uncommon

• Visual disturbances — less common with tadalafil than sildenafil due to greater PDE5 selectivity
• Palpitations or tachycardia
• Hypotension, particularly in combination with antihypertensives or alpha-blockers

Who Should Not Take Tadalafil

A clinical assessment before prescribing is specifically designed to identify the following. Do not take tadalafil if you:

• Take nitrate medicines in any form — GTN spray or patches, isosorbide mononitrate or dinitrate, or recreational “poppers” (amyl nitrite, butyl nitrite). The combination with tadalafil causes a severe and potentially fatal drop in blood pressure. This is an absolute contraindication with no exceptions.
• Take riociguat (Adempas), used for pulmonary hypertension
• Have been advised to avoid sexual activity for cardiovascular reasons
• Have had a stroke or myocardial infarction within the past 6 months
• Have severe hepatic impairment
• Have severe hypotension (resting blood pressure below 90/50 mmHg)
• Have uncontrolled hypertension (above 170/110 mmHg)
• Have a hereditary degenerative retinal disorder such as retinitis pigmentosa

Key Drug Interactions

For a comprehensive overview of erectile dysfunction — causes, symptoms, and all treatment options — visit our complete guide to erectile dysfunction.