Services
- What is Cialis and how does it work?
- Is Cialis available without prescription in the UK?
- General information about tadalafil
- Indications and uses
- Price and availability
- Dosage forms, strengths and generic options
- Erectile dysfunction and benign prostatic hyperplasia
- UK legal classification
- Alternatives to Cialis
- Comparing PDE5 inhibitors
- Food and lifestyle considerations
- Side effects and tolerability
- Long-term use and safety considerations
- Warnings and interactions
- Additional information about Cialis
What is Cialis and how does it work?
Cialis is the brand name for tadalafil, a prescription medication belonging to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. It is primarily prescribed to treat erectile dysfunction (ED) in adult men and, under certain formulations, benign prostatic hyperplasia (BPH) – an enlargement of the prostate gland. Cialis works by increasing blood flow to the penis during sexual stimulation, enabling an erection when sexual arousal occurs. Unlike some medications that act immediately and for a short duration, tadalafil remains active in the body for up to 36 hours, earning it the nickname “The Weekend Pill.”
The mechanism of action involves inhibition of the PDE5 enzyme, which normally breaks down cyclic guanosine monophosphate (cGMP). cGMP is a molecule that relaxes smooth muscle cells in the blood vessel walls; higher levels of cGMP promote vasodilation and enhance erectile response. By blocking PDE5, Cialis prolongs the effect of nitric oxide released during sexual arousal, thus facilitating an erection sufficient for sexual intercourse.
Cialis can be taken as needed before sexual activity or in a lower daily dose, allowing increased spontaneity. The choice between on-demand and daily dosing depends on individual preference, partner expectations, and the frequency of sexual activity. Daily tadalafil provides a consistent level of medication and may be advantageous for men who anticipate sexual activity two or more times per week.
As a PDE5 inhibitor, Cialis shares its therapeutic class with sildenafil (Viagra), vardenafil (Levitra) and avanafil (Stendra). Each has its own pharmacokinetic profile, dosing recommendations, and tolerability considerations. Cialis’s extended half-life distinguishes it from other PDE5 inhibitors, offering a more flexible dosing schedule.
Although effective for many men, Cialis does not address all causes of erectile dysfunction. Psychological factors, neurological conditions, hormonal imbalances and severe cardiovascular issues may require alternative or adjunctive treatments. A healthcare professional can determine whether Cialis is appropriate for a particular patient based on medical history, concomitant medications and individual risk factors.
When obtained legally with a valid prescription, Cialis is considered safe and effective. However, outside the regulated pharmacy environment, unverified sources may offer counterfeit, substandard or contaminated products. Markeaton Pharmacy ensures that Cialis and generic tadalafil products supplied online in the UK meet stringent quality standards.
Is Cialis available without prescription in the UK?
In the United Kingdom, Cialis (tadalafil) is classified as a Prescription Only Medicine (POM) by the Medicines and Healthcare products Regulatory Agency (MHRA). This means that a valid prescription from a qualified healthcare professional is required for legal supply. Unlike certain low-dose proton pump inhibitors or antihistamines, Cialis is not available as a pharmacy medicine (P) or general sales list (GSL) product.
This prescription requirement reflects the need for professional assessment of cardiovascular status, contraindications and potential drug interactions before initiating PDE5 inhibitor therapy. Requirements include evaluation of underlying conditions such as coronary artery disease, arrhythmias, uncontrolled hypertension or hypotension, and concomitant use of nitrates or riociguat, which can lead to serious adverse effects if combined with PDE5 inhibitors.
Despite the POM status, some online pharmacies offer “purchase Cialis without prescription” services. While these sites may appear convenient, they often operate outside MHRA regulations. There are significant risks in purchasing medication from unregulated or overseas vendors, including the possibility of receiving counterfeit, subtherapeutic or harmful products. Markeaton Pharmacy strictly adheres to UK pharmacy law and will only dispense Cialis under a valid prescription.
For UK residents seeking lawful access, virtual consultations and online prescription services are available through registered pharmacists and prescribers. After an appropriate health check, a prescription can be issued electronically and exchanged for Cialis at Markeaton Pharmacy, whether in-store or via our secure online checkout. This process ensures product authenticity, safe dosing, and professional oversight.
Occasionally, special reclassification efforts may permit low-dose tadalafil formulations for over-the-counter sale, but no such changes have been implemented as of September 2026. Patients are advised to remain cautious of marketing claims promising entirely prescription-free access in the UK. Always verify the pharmacy’s MHRA registration and professional credentials.
In summary, while it is possible to encounter websites selling Cialis “without prescription,” such transactions carry significant legal and health risks. The safest, most reliable route is to consult with a qualified healthcare professional and obtain Cialis through a registered UK pharmacy like Markeaton.
General information about tadalafil
What is tadalafil?
Tadalafil is the active pharmaceutical ingredient (API) in Cialis. It is a potent and selective inhibitor of the PDE5 enzyme, responsible for the degradation of cGMP in smooth muscle cells lining blood vessels supplying the corpus cavernosum in the penis.
Tadalafil pharmacokinetics
After oral administration, tadalafil is absorbed slowly, with maximum plasma concentration (C_max) reached within 2 hours in a fasted state. The half-life of tadalafil is approximately 17.5 hours, considerably longer than sildenafil or vardenafil, allowing for a therapeutic window of up to 36 hours. Food does not significantly affect the absorption of tadalafil, making it flexible in timing relative to meals.
Metabolism and excretion
Tadalafil is primarily metabolised by the hepatic enzyme CYP3A4 to pharmacologically active metabolites. The majority of an administered dose is excreted in the faeces (approximately 61%), with renal excretion accounting for around 36%. In patients with severe renal or hepatic impairment, dosage adjustment or alternative therapies may be necessary.
Tadalafil versus other PDE5 inhibitors
Compared with sildenafil and vardenafil, tadalafil offers extended duration of action and more flexible dosing schedules. Avanafil, a newer PDE5 inhibitor, has a more rapid onset but shorter duration. Selection among these agents depends on patient lifestyle, frequency of sexual activity, and tolerance of side effects.
Generic tadalafil
Generic tadalafil products contain the same active ingredient and must meet bioequivalence criteria set by regulatory authorities. Generics may differ in inactive ingredients, tablet shape, coating or packaging but deliver equivalent therapeutic effects when sourced from reputable, authorised manufacturers. Purchasing generic tadalafil can often reduce the price per dose, making long-term therapy more affordable.
Storage and handling
Cialis and generic tadalafil tablets should be stored in their original packaging at room temperature (15°C–25°C), away from moisture and heat. Do not use tablets past the expiry date. Keep medicines out of the reach of children and pets to avoid accidental ingestion.
Indications and uses
Erectile dysfunction (ED)
The primary licensed indication for Cialis is the treatment of erectile dysfunction in adult men. ED is defined as the inability to achieve or maintain an erection sufficient for satisfactory sexual performance. Tadalafil improves erectile response to sexual stimulation by enhancing the effect of nitric oxide released in the corpus cavernosum.
Benign prostatic hyperplasia (BPH)
Cialis 5 mg daily is also authorised for the treatment of signs and symptoms of benign prostatic hyperplasia (BPH) in men with or without erectile dysfunction. BPH is characterised by non-malignant enlargement of the prostate gland, leading to lower urinary tract symptoms such as increased frequency, urgency, nocturia and decreased urinary flow.
Concurrent ED and BPH
Tadalafil offers a unique dual indication for men with both ED and BPH. A once-daily 5 mg dose can address both conditions simultaneously, improving sexual function and urinary symptoms, while maintaining convenience and adherence.
Off-label uses
Occasionally, tadalafil is used off-label for pulmonary arterial hypertension (PAH) under different trade names and dosing regimens. However, patients should only use tadalafil for PAH under specialist supervision and with the appropriate product licence.
Duration of therapy
On-demand tadalafil can be used intermittently, taken at least 30 minutes before sexual activity, and its effects may last up to 36 hours. Daily tadalafil is indicated when sexual activity is anticipated twice weekly or more, providing continuous PDE5 inhibition.
Clinical considerations
Treatment choice depends on patient preference, frequency of anticipated sexual activity, comorbidities and potential interactions. Healthcare professionals must evaluate cardiovascular status, co-prescribed medications and contraindications prior to initiating therapy.
Price and availability
How much does Cialis cost in the UK?
Prices for Cialis and generic tadalafil vary by brand, dosage, pack size and retailer. Markeaton Pharmacy offers competitive pricing for both branded and generic products, with frequent promotions and bulk purchase discounts for registered customers.
The following table provides example price ranges, which may change over time. For the most up-to-date prices, please enquire in-store or via our secure online platform.
| Product | Strength | Pack size | Approximate Price (GBP) | Status |
|---|---|---|---|---|
| Cialis (branded) | 10 mg | 4 tablets | £40–£60 | Prescription only |
| Cialis (branded) | 20 mg | 4 tablets | £60–£80 | Prescription only |
| Generic tadalafil | 10 mg | 10 tablets | £25–£40 | Prescription only |
| Generic tadalafil | 20 mg | 10 tablets | £40–£55 | Prescription only |
| Generic tadalafil | 5 mg (daily dose) | 28 tablets | £35–£50 | Prescription only |
Why do prices vary?
Variations reflect differences in brand name versus generic, pack size, dosage, distribution costs and pharmacy pricing policies. Bulk orders or subscription services may further reduce the unit cost, offering cheaper per-tablet prices for regular users.
Online ordering
Markeaton Pharmacy provides an online ordering system for registered patients with valid prescriptions. Competitive delivery options include standard, next-day and discreet packaging. All orders undergo pharmacist verification to ensure safety and correct dispensing.
Discounts and loyalty
Frequent purchasers can benefit from loyalty schemes, promotional discount codes and seasonal offers. Generic tadalafil is typically cheaper than the branded product, offering equivalent efficacy and quality.
Dosage forms, strengths and generic options
Available strengths
Cialis and generic tadalafil are supplied in various strengths: 5 mg, 10 mg and 20 mg tablets. The 5 mg formulation is intended for once-daily use, whereas 10 mg and 20 mg tablets are for on-demand dosing.
Tablet formulation
Each tablet contains tadalafil in a gastro-resistant matrix to protect the active ingredient from gastric acids and ensure rapid absorption in the small intestine. Inactive ingredients may vary between manufacturers but do not affect efficacy when sourced from authorised suppliers.
Generic versus branded
Generic tadalafil must demonstrate bioequivalence to the reference branded product. Differences are limited to non-active components, guaranteeing identical therapeutic outcomes. Generics often cost significantly less, making treatment more affordable for long-term users.
Pack size considerations
Pack sizes range from single blister packs to multi-pack bundles. Smaller packs offer flexibility for those trying the treatment for the first time, while larger packs reduce the per-tablet price for continuous users. MHRA regulations require prescription details on all pack labels.
Special patient populations
In patients with renal impairment (creatinine clearance <30 mL/min) or severe hepatic impairment, the maximum recommended dosage is 10 mg on demand, not to exceed once per 72 hours. Healthcare professionals may advise dose adjustments based on comorbidities and concomitant medications.
Storage and handling
Store tablets in original packaging at room temperature, protected from moisture and light. Do not split tablets unless the tablet is scored and the patient information leaflet advises that splitting is permissible.
Erectile dysfunction and benign prostatic hyperplasia
Understanding erectile dysfunction
Erectile dysfunction is a multifactorial condition affecting physical and psychological health. Risk factors include aging, cardiovascular disease, diabetes, obesity, stress and certain medications. Effective management requires addressing underlying causes as well as symptomatic relief.
Tadalafil in ED management
Cialis improves erectile response when sexual stimulation occurs. Its long duration supports spontaneous sexual activity without the need for precise planning. Daily dosing may normalize erectile function over time, reducing performance anxiety.
Understanding BPH
Benign prostatic hyperplasia involves enlargement of the prostate gland, leading to compression of the urethra and lower urinary tract symptoms. Tadalafil relaxes smooth muscle in the prostate and bladder neck, improving urinary flow and reducing symptom burden.
Treatment outcomes
Clinical trials demonstrate significant improvement in International Index of Erectile Function (IIEF) scores with tadalafil. For BPH symptoms, tadalafil reduces International Prostate Symptom Score (IPSS) and increases maximum urinary flow rate.
Combination therapy
In some patients, combination of PDE5 inhibitors with alpha-blockers may be considered for BPH, but this requires specialist oversight due to potential blood pressure effects. Patients should be monitored for dizziness, hypotension and drug interactions.
Monitoring and follow-up
Regular follow-up with a healthcare professional is recommended to assess efficacy, tolerability and any emerging side effects. Lifestyle modifications and management of comorbidities enhance long-term treatment success.
UK legal classification
Prescription Only Medicine (POM)
Cialis and generic tadalafil are classified as POM in the UK. A valid prescription from a qualified prescriber is mandatory for lawful supply. Pharmacists dispense only against an original or electronic prescription that meets MHRA requirements.
No OTC availability
Unlike certain low-dose antihistamines and digestive aids, tadalafil has not been reclassified for OTC or pharmacy-only supply. PPI status does not apply to PDE5 inhibitors due to the need for cardiovascular risk assessment.
Why classification matters
Controlled supply ensures patient safety, appropriate use, and monitoring for contraindications. Classification considers factors such as severity of underlying conditions, potential for misuse, and the importance of medical oversight.
MHRA regulation
The MHRA oversees licensing, classification and post-marketing surveillance of all medicines in the UK. Any reclassification proposals for tadalafil would require robust evidence of safety and suitability for non-prescription use.
International differences
In some countries, low-dose tadalafil may be available OTC or via pharmacy-only supply. UK regulations remain more conservative, reflecting the need for a prescription to manage coexisting health risks.
Legal risks of unauthorized supply
Purchasing Cialis without a prescription from unregulated sources may breach UK law and expose consumers to counterfeit or unsafe products. Markeaton Pharmacy maintains full compliance with all legal requirements.
Alternatives to Cialis
Sildenafil (Viagra)
The first PDE5 inhibitor, sildenafil, is taken 30–60 minutes before sexual activity and remains active for up to 4–6 hours. It requires timing relative to expected intercourse and may be affected by high-fat meals.
Vardenafil (Levitra)
Vardenafil has a similar duration to sildenafil but may offer greater potency in some men. It is generally taken 30–60 minutes before sexual activity.
Avanafil (Stendra)
Avanafil has a rapid onset of action (as little as 15 minutes) and a duration of around 6–12 hours. It offers convenience for spontaneous use but a shorter window compared with tadalafil.
Alprostadil
Alprostadil can be administered via urethral suppository or intracavernosal injection. It directly induces vasodilation but is more invasive and may cause local penile pain or fibrosis.
Lifestyle interventions
Weight management, exercise, smoking cessation, moderation of alcohol and addressing sleep disorders can improve erectile function. Psychological therapies, such as cognitive behavioural therapy, may be beneficial for stress-related ED.
Hormonal therapy
In men with low testosterone levels, testosterone replacement therapy can be considered, often in conjunction with PDE5 inhibitors for optimal results. Monitoring of hormone levels and prostate health is essential.
Comparing PDE5 inhibitors
Choosing the most suitable PDE5 inhibitor depends on onset, duration, side effect profile, patient lifestyle and cost. The table below summarizes key differences:
| Feature | Cialis (Tadalafil) | Viagra (Sildenafil) | Levitra (Vardenafil) | Stendra (Avanafil) |
| Class | PDE5 inhibitor | PDE5 inhibitor | PDE5 inhibitor | PDE5 inhibitor |
| Onset | 30–120 minutes | 30–60 minutes | 30–60 minutes | 15–30 minutes |
| Duration | Up to 36 hours | 4–6 hours | 4–6 hours | 6–12 hours |
| Food effect | Minimal | High-fat delays absorption | Moderate | Minimal |
| Daily dosing option | Yes (5 mg) | No | No | No |
| Cost per dose | Moderate | Lower | Moderate | Higher |
No single PDE5 inhibitor is universally superior. Individual factors such as comorbidities, previous response, preference for spontaneity, and cost should guide selection.
Food and lifestyle considerations
Dietary influences
Large or fatty meals can delay absorption of sildenafil and vardenafil, but have minimal impact on tadalafil and avanafil. Drinking water or a light snack may optimize onset of action.
Alcohol consumption
Moderate alcohol intake may be compatible with PDE5 inhibitors, but excessive drinking can impair erectile function and increase the risk of orthostatic hypotension when combined with vasodilatory drugs.
Smoking and vascular health
Tobacco smoke contributes to endothelial dysfunction and atherosclerosis, which can exacerbate ED. Smoking cessation improves overall cardiovascular and sexual health.
Exercise and weight
Regular physical activity and maintaining a healthy weight can enhance erectile function by improving endothelial function, circulation and hormonal balance.
Psychological factors
Stress, anxiety and depression can contribute to ED. Psychological counselling, stress management techniques and couples therapy may be beneficial alongside pharmacotherapy.
Sleep and overall health
Poor sleep patterns, sleep apnoea and shift work disrupt hormonal regulation and may impair erectile function. Addressing sleep disorders can improve both general and sexual health.
Side effects and tolerability
Common side effects
Side effects occur in a minority of patients and often resolve spontaneously. Common adverse reactions include headache, flushing, dyspepsia, back pain and nasal congestion. The incidence and severity vary between agents.
Less common and rare effects
Occasionally, dizziness, visual disturbances (blue vision), tinnitus, priapism (prolonged erection) or hypotension may occur. Priapism is a medical emergency requiring immediate attention to avoid permanent tissue damage.
Long-term tolerability
Long-term daily tadalafil is generally well tolerated, but patients should be monitored for persistent back pain or myalgia. Annual review of therapy assesses ongoing benefit versus risk.
Allergic reactions
Serious hypersensitivity reactions are rare but possible. Signs include rash, itching, facial swelling or difficulty breathing. Seek emergency care if these symptoms develop.
Managing side effects
Adjusting dose, timing, or switching to an alternative PDE5 inhibitor can alleviate intolerable effects. Simple measures like staying hydrated or avoiding heavy meals can also help.
Reporting adverse events
Patients and healthcare professionals are encouraged to report suspected adverse drug reactions to the MHRA Yellow Card Scheme to support ongoing safety monitoring.
Long-term use and safety considerations
Safety of daily tadalafil
Daily tadalafil at 5 mg has been studied for up to one year, showing sustained efficacy and acceptable tolerability. Routine monitoring of renal and hepatic function may be advised in patients with underlying organ impairment.
Nutrient absorption
No clinically significant effects on nutrient absorption have been reported with PDE5 inhibitors. However, managing comorbidities, such as diabetes, remains important for overall health.
Cardiovascular risk
Sexual activity exerts physiological stress. Patients with significant heart disease should be assessed to ensure they can safely engage in sexual activity and tolerate PDE5 inhibitors without exacerbating angina or arrhythmias.
Drug tolerance
No evidence suggests tachyphylaxis (decreased response) with long-term tadalafil. Consistent dosing maintains efficacy for most patients.
Switching therapies
Patients experiencing diminishing benefit or side effect intolerance may switch to another PDE5 inhibitor after a washout period. Consultation with a healthcare professional ensures safe transition.
Periodic review
An annual medication review allows assessment of ongoing need, efficacy, side effects and the potential for dose adjustment or discontinuation.
Warnings and interactions
Contraindications
- Concurrent nitrate therapy (e.g., nitroglycerin)
- Riociguat use
- Severe cardiovascular disorders
- Uncontrolled hypertension or hypotension
- Severe hepatic or renal impairment without dose adjustment
Clinically significant interactions
CYP3A4 inhibitors (e.g., ketoconazole, ritonavir) increase tadalafil exposure, requiring dose reduction. CYP3A4 inducers (e.g., rifampicin, carbamazepine) may reduce efficacy.
Blood pressure effects
Tadalafil may potentiate the antihypertensive effect of alpha-blockers or antihypertensive medications, leading to symptomatic hypotension. Initiate co-prescription with caution and monitor blood pressure.
Use in special populations
Patients over 65 years, those with mild to moderate kidney or liver disease, and those on multiple medications require careful dose selection and monitoring.
Pregnancy and breastfeeding
Cialis is not indicated for use in females. Pregnant or breastfeeding women should avoid handling crushed or broken tablets due to potential systemic exposure.
Warning symptoms
Patients experiencing chest pain, severe dizziness or sudden vision or hearing loss should cease tadalafil and seek immediate medical attention.
Additional information about Cialis
Generic tadalafil meaning
A generic medicine contains the same active ingredient, strength and dosage form as the reference branded product and must demonstrate bioequivalence. Inactive ingredients may differ, but therapeutic effect remains unchanged.
Differences in product leaflets
Generic tadalafil packages include patient information leaflets specific to the manufacturer, listing excipients, side effects, storage and legal details. Always read the leaflet provided with your medicine.
Why check exact product information?
Each authorised product has specific indications, dosage regimens, contraindications and handling instructions. Refer to the Summary of Product Characteristics (SmPC) or the patient leaflet to confirm details.
Where to verify UK medicine information
Reliable resources include the MHRA website, the electronic Medicines Compendium (eMC) and qualified healthcare professionals. These sources provide up-to-date regulatory and safety information.
Does this replace pharmacist advice?
This page offers general information from Markeaton Pharmacy, 126 Kedleston Road, Derby, DE22 1FX. It does not substitute for personalised advice. For tailored guidance, speak with our pharmacy team in store or via our online consultation service.