Cialis (tadalafil) is a prescription-only medicine (POM) in the UK and cannot be supplied without a valid prescription from a qualified healthcare professional. Unlike certain mild medicines available as Pharmacy (P) or General Sales List (GSL) products, tadalafil for erectile dysfunction is carefully regulated due to the need for medical assessment of cardiovascular and other health risks. However, patients can obtain a prescription and then purchase generic Cialis at a lower price and with fast delivery online for convenience. Elstree Pharmacy makes this process streamlined by offering secure order portals, discreet packaging and professional pharmacy checks before dispatch.
The UK categorises human medicines into three main legal supply classifications: Prescription Only Medicines (POM), Pharmacy only medicines (P) and General Sales List medicines (GSL). Pharmacy medicines (P) do not require a doctor’s prescription but must be sold under the supervision of a pharmacist, ensuring patient advice and monitoring. In contrast, GSL products such as some cold remedies can be sold in supermarkets. Because Cialis carries potential cardiovascular risks and drug interactions, it remains POM. Generic tadalafil can be cheaper than the brand, but it must still be supplied following a prescription and clinical check.
Cialis is a brand name for the active pharmaceutical ingredient tadalafil. It belongs to a class of medicines called phosphodiesterase type 5 (PDE5) inhibitors, which are widely used for the treatment of erectile dysfunction (ED) and symptoms of benign prostatic hyperplasia (BPH).
PDE5 inhibitors act by blocking the enzyme phosphodiesterase type 5 in smooth muscle cells of the penis, enhancing natural erectile response during sexual stimulation. Other PDE5 inhibitors include sildenafil (Viagra), vardenafil (Levitra) and avanafil (Spedra).
The active ingredient is tadalafil. Generic tadalafil products are authorised to have the same therapeutic effects, safety profile and dosage strengths as branded Cialis when manufactured under the same regulatory standards.
Tadalafil has a longer half-life (up to 17.5 hours) than other PDE5 inhibitors, providing extended efficacy. This allows for more spontaneity and dosing flexibility in sexual activity compared with shorter-acting alternatives.
Beyond erectile dysfunction, tadalafil is licensed for benign prostatic hyperplasia and pulmonary arterial hypertension under different brand names and dosages. These therapeutic uses require careful dose adjustments and ongoing medical supervision.
Generic tadalafil contains the same active ingredient at the same strength as branded Cialis. Excipients and tablet appearance may differ, but quality, safety and efficacy standards are equivalent according to MHRA and EMA requirements.
Tadalafil inhibits the PDE5 enzyme in smooth muscle cells lining blood vessels in the corpus cavernosum of the penis. By reducing PDE5 activity, tadalafil increases levels of cyclic guanosine monophosphate (cGMP), relaxing smooth muscle, dilating blood vessels and enabling increased blood inflow that supports an erection in response to sexual stimulation.
Cialis can begin to work in as little as 30 minutes, though full efficacy typically occurs within 1–2 hours after dosing. Due to its long duration, erectile function may be improved for up to 36 hours following a single dose, which has led to its “weekend pill” nickname.
No. Cialis enhances the physiological process of erection, which still requires sexual arousal and nitric oxide release. It does not induce spontaneous or uncontrollable erections.
Tadalafil is primarily metabolised in the liver via CYP3A4 enzymes to inactive metabolites, which are then excreted mainly in the faeces and to a lesser extent in urine. Dosage adjustments are required for moderate to severe renal or hepatic impairment.
Cialis can be taken with or without food. Alcohol in moderate amounts typically does not reduce its effectiveness, but excessive drinking can worsen erectile dysfunction and increase the risk of side effects such as low blood pressure or dizziness.
The price of Cialis varies by brand, strength, pack size, pharmacy and whether the product is branded or generic. Generic tadalafil products often offer significant savings compared with branded Cialis while maintaining the same clinical effect. Prices may range from £1.50 to £10 per tablet depending on strength (5 mg, 10 mg, 20 mg) and ordering channel. Shipping costs or additional pharmacy fees may apply.
Variations reflect procurement costs, brand versus generic status, pack sizes, marketing strategies and retailer discounts. Bulk buying or subscription services can further reduce per-tablet prices. Always confirm current prices directly with Elstree Pharmacy for the latest offers.
| Example | Strength | Formulation | Price | Status | Note |
|---|---|---|---|---|---|
| Generic Tadalafil A | 10 mg | Film-coated tablet | £2.50 | Information only | Order online for fast delivery |
| Branded Cialis | 20 mg | Film-coated tablet | £8.00 | Information only | Prescription required |
Tadalafil is available in 2.5 mg, 5 mg, 10 mg and 20 mg strengths. Lower doses are often prescribed for daily use to permit spontaneous sexual activity, while higher single doses are used on demand before planned intercourse.
Most tadalafil products are supplied as film-coated tablets for oral administration. Chewable or orally disintegrating formulations may exist under specialist brands. Tablets should be swallowed whole with water.
Pack sizes vary from 4, 8, 28 or more tablets. Larger packs reduce unit cost and suit patients requiring regular daily dosing, while smaller packs are suitable for occasional on-demand use or trial runs under medical guidance.
| Feature | Why it matters |
| Strength | Determines dose and duration of effect |
| Formulation | Affects ease of swallowing and absorption |
| Pack size | Impacts cost per tablet and treatment planning |
| Dosage regimen | Daily vs on-demand use |
| Legal category | Dictates prescription requirements |
Under MHRA guidance, generic tadalafil may be interchanged with branded Cialis if the product is licensed as pharmaceutically equivalent and bioequivalent. Pharmacists can advise patients on suitable generic alternatives based on supply and price.
Erectile dysfunction (ED) is the inability to achieve or maintain an erection sufficient for satisfactory sexual performance. Causes can be vasculogenic, neurogenic, psychogenic or mixed.
BPH is a non-cancerous enlargement of the prostate gland leading to urinary symptoms. Daily low-dose tadalafil (5 mg) is licensed to help relieve both ED and BPH symptoms in men with coexisting conditions.
ED may be an early warning sign for cardiovascular disease, diabetes or hormonal disorders. Medical evaluation is recommended for men with persistent or new-onset ED to rule out underlying pathology.
While erectile function can decline with age, ED is not inevitable. Lifestyle factors, medical conditions and medications all play roles. Effective treatments exist, and professional advice can identify and manage reversible causes.
Men experiencing ED that causes distress or relationship difficulties should consult a healthcare professional. Open discussion can lead to effective, personalized treatment plans.
A Prescription Only Medicine (POM) may only be supplied against a doctor’s prescription or through certain remote supply protocols under pharmacist supervision. Cialis remains POM due to potential risks and required medical oversight.
Pharmacy (P) medicines do not require a prescription but must be sold in a pharmacy. ED treatments do not qualify because of the need for cardiovascular and drug interaction checks.
GSL medicines are safe enough for general retail. ED treatments are excluded from this category.
Classification reflects intended use, dosage, duration and safety considerations. Tadalafil used for pulmonary hypertension under a different brand may also be POM with special criteria.
The Medicines and Healthcare products Regulatory Agency (MHRA) decides legal categories and approves reclassifications based on safety data and expert advice.
Sildenafil and vardenafil have shorter half-lives (4–6 hours) and require timing relative to meals. Avanafil acts faster (<30 minutes) but has a shorter duration (6–12 hours).
For men who cannot use PDE5 inhibitors due to contraindications or lack of response, mechanical devices, psychological therapy or surgery may be considered under specialist care.
Cialis (tadalafil) lasts up to 36 hours, while Viagra (sildenafil) lasts around 4–6 hours. Cialis dosing offers more spontaneity, whereas Viagra requires precise timing before sexual activity.
Levitra (vardenafil) has a similar onset to Viagra and lasts around 6–8 hours. It may offer advantage in men with diabetes or post-prostatectomy ED per some studies.
| Feature | Cialis (Tadalafil) | Viagra (Sildenafil) | Avanafil |
| Drug class | PDE5 inhibitor | PDE5 inhibitor | PDE5 inhibitor |
| Onset | 30–60 min | 30–60 min | 15–30 min |
| Duration | Up to 36 h | 4–6 h | 6–12 h |
| Food effects | Minimal | High-fat delays | Less affected |
No. Choice depends on lifestyle, onset preference, duration, comorbidities and prior response. Healthcare professionals tailor treatment based on individual needs.
A balanced diet supports vascular health. Mediterranean-style diets rich in fruits, vegetables, whole grains and healthy fats can improve blood flow and erectile function over time.
Light to moderate alcohol may not impair tadalafil effectiveness, but excessive intake can worsen ED and exacerbate side effects such as dizziness or low blood pressure.
Smoking damages blood vessels and impairs nitric oxide availability, contributing to vascular ED. Quitting smoking improves erectile function and cardiovascular health.
Regular physical activity enhances cardiovascular fitness, reduces stress and supports healthy weight—all factors that can improve erectile function and overall wellbeing.
Psychological stress and anxiety can interfere with sexual performance. Techniques like mindfulness, relaxation exercises and counseling can alleviate performance-related anxiety.
Yes. Tadalafil may cause headaches, flushing, back pain, myalgia, dyspepsia and nasal congestion. Side effects are usually mild to moderate and often resolve within hours to days.
| Area | Common Effects |
| Headache | Mild to moderate |
| Musculoskeletal | Back pain, muscle aches |
| Digestive | Indigestion, nausea |
| Circulatory | Flushing, hypotension |
| Respiratory | Nasal congestion |
Rarely, tadalafil can cause priapism (prolonged erection >4 h), sudden vision loss (NAION), or hearing loss. These require immediate medical attention.
Regulatory guidelines require disclosure of all observed adverse events to inform healthcare professionals and patients of potential risks.
Higher doses may increase incidence of side effects. Individual tolerance varies, and dose adjustments can optimize benefit-risk balance.
Daily tadalafil (2.5–5 mg) is generally well tolerated for long-term management of ED and BPH under medical supervision. Regular review ensures continued appropriateness of therapy.
Men on long-term PDE5 inhibitors should have periodic assessments of cardiovascular status, renal and hepatic function and review of concomitant medications.
Tolerance to PDE5 inhibitors is uncommon. Efficacy often remains stable over prolonged use, but dose adjustment or switching agents may be needed in some cases.
Daily low-dose tadalafil allows for unplanned sexual activity without timing concerns, improving quality of life for some patients and their partners.
Yes. Concomitant use with nitrates is absolutely contraindicated due to risk of profound hypotension. Caution also applies with alpha-blockers, certain antifungals, protease inhibitors and macrolide antibiotics due to CYP3A4 interactions.
Nitrates increase nitric oxide and cGMP levels; combining with PDE5 inhibitors can cause severe, symptomatic hypotension.
Grapefruit juice inhibits CYP3A4, potentially increasing tadalafil exposure and risk of side effects. Patients should avoid excessive consumption around dosing.
Tadalafil is not indicated for women. Pregnancy and breastfeeding information is not applicable, but accidental exposure should be reported to healthcare professionals.
Generic tadalafil contains the same active molecule as branded Cialis and must meet equivalent standards for quality, safety and efficacy. Manufacturers may vary, but regulatory oversight ensures consistency.
Different generics may have distinct excipients, tablet shape, colour and packaging. Patient leaflets vary to reflect product-specific information, though core safety and efficacy data are shared.
Film-coating protects the tablet, masks taste and improves swallowing. It may also aid stability and control release characteristics of the active ingredient.
Medicine regulation applies at the product level. Details such as approved indications, dosage regimens, contraindications and packaging instructions can differ. Always verify the Summary of Product Characteristics and patient leaflet for the exact product supplied.
Reliable sources include the MHRA, electronic Medicines Compendium, NICE guidelines and professional pharmacy advice. Seek tailored guidance from Elstree Pharmacy or your GP for personalized recommendations.
No. This page is general information provided by Elstree Pharmacy (The Corner Shop B, High Street, Elstree, WD6 3BY). For advice tailored to your circumstances, please speak directly with our pharmacy team or your healthcare provider.
