Summary of the material
Cialis Black is a trade name sometimes encountered online for products that claim to contain tadalafil. Tadalafil is a phosphodiesterase type 5 (PDE5) inhibitor that works by relaxing vascular smooth muscle to improve blood flow in targeted areas.
Rapid reference for the key points:
- Active substance typically described: tadalafil.
- Authorized uses for tadalafil include treatment of erectile dysfunction (ED), some formulas for lower urinary tract symptoms due to benign prostatic hyperplasia (BPH), and specialist regimens for pulmonary arterial hypertension (PAH).
- Some internet sellers advertise very large strengths such as 800 mg for so-called "Cialis Black" tablets. This strength is not an authorised dose in the UK and should be treated with suspicion. View the legal and dosage sections for extra information.
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Red flags
When tadalafil is prescribed and dispensed appropriately in the UK, licensed traces include:
- Erectile dysfunction - to help achieve and sustain an erection adequate for sexual activity.
- Lower urinary tract symptoms related to BPH - certain doses may ease urinary complaints in men.
- Pulmonary arterial hypertension - specialist formulations and specific dosing schedules under specialist supervision.
The therapeutic effect comes from increased blood flow to specific tissues through relaxation of blood vessel smooth muscle.
How to Take This Step by Step and Dosage
Follow the prescriber's instructions along with the product label precisely. Do not change the dose or how often you take the medicine without medical advice. Please consult a professional the mitigating steps section before altering treatment.
- As-needed dosing: some people take tadalafil before sexual activity. Do not take more than one such dose in any 24 hour period.
- Daily dosing: some licensed products are intended to be taken once daily at a low strength for continuous coverage.
- How to take a bite: swallow tablets with water. They can be taken with or without food.
Important safety reminder: marketed strengths such as "Cialis Black 800 mg" do not match authorised tadalafil doses in the UK. Typical licensed strengths are 2.5 mg and 5 mg for daily use and 10 mg or 20 mg for as-needed use. Unknown or extreme doses may be dangerous. If you encounter unfamiliar strengths, seek clinical advice and avoid unregulated products.
Safety Protocols and Safety guarding measures
Prior to starting tadalafil, tell the prescriber about any existing health problems and any medicines, supplements or recreational drugs you use. Extra monitoring or dose changes may be necessary for people with:
- Heart disease such as recent heart attack, unstable angina, significant arrhythmias, or other serious cardiac conditions.
- Uncontrolled high or low blood pressure, or some forms of pulmonary hypertension not treated with suitable medications.
- Moderate or severe liver or kidney impairment; dialysis patients need specialist advice.
- Eye disorders including sudden vision changes or inherited retinal conditions like retinitis pigmentosa.
- Blood disorders such as sickle cell disease, myeloma, and leukemia.
- Penile deformities or a history of prolonged erections (priapism).
- Active bleeding ulcers or other bleeding disorders.
- Any condition where sexual activity is inadvisable for medical reasons.
If you are uncertain about how other substances might interacta thorough review the medication the dynamic of social contacts between people can shape outcomes. section and discuss everything you take in partnership with your clinician.
Not indicated conditions
- Allergy to tadalafil or any excipient in the product.
- Concurrent nitrate therapy in any form, including recreational amyl nitrite - combining nitrates and tadalafil can cause a severe drop in blood pressure.
- Use together with riociguat is contraindicated because of additive hypotensive effects.
Do not co-mingle. tadalafil with other vasodilators unless a specialist prescriber has advised it.
Potential drug ripple effects
Mild to moderate detrimental health effects are relatively common and usually temporary. Frequently reported reactions include:
- Head pressure and facial flushing altogether.
- Nasal obstruction or a runny nose.
- Epigastric distress, nausea or dyspepsia.
- Muscle aches, back pain or limb discomfort.
Seek urgent medical care if you experience chest pain, sudden loss of vision or hearing, symptoms of a severe allergic reaction, or an erection lasting longer than four hours (priapism).
Drug Interaction Safety
Always disclose all prescribed medicines, over-the-counter products, herbal remedies and recreational substances to your prescriber. Essential social interactions are the heartbeat of social platforms. to consider include:
- Nitrates and nitric oxide donors - strictly contraindicated. See conditions under which this therapy should be avoided.
- Riociguat - combination may cause dangerously low blood pressure.
- Other PDE5 inhibitors - avoid combining tadalafil with sildenafil, vardenafil, avanafil or similar agents.
- Strong CYP3A4 inhibitors (for example some macrolide antibiotics, certain azole antifungals, some antiretroviral agents) - can increase tadalafil levels.
- Alpha-blockers used for prostate symptoms or high blood pressure - combined use can cause a marked fall in blood pressure.
- Some anticonvulsants and enzyme-inducing drugs - can reduce tadalafil exposure.
If you are prescribed drugs that interact, do not stop or change treatment without professional advice.
Dose was not taken today
For as-needed use there is no fixed schedule. For daily therapy, take the the dose was skipped as soon as you remember unless the next dose is due soon. Do not take two doses at once to compensate for a the dose was skipped.
What You Should Do During an An overdosed
Signs of suspected overdose may include severe dizziness, fainting, significant drop in blood pressure, or prolonged painful erection. If you suspect an suspected overdose, call emergency services or jump to the nearest emergency department right away. Take the medicine packaging with you if available.
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- Store at normal room temperature away from excessive heat and moisture.
- Keep medications away from children and pets, both out of reach and out of sight.
- Keep tablets in their original packaging to preserve expiry information and protect from damage.
Other Options for Similar Medications
Several licensed other routes are available in the UK for erectile dysfunction and related conditions. Choice depends on individual response, side effect profile, onset and duration:
- Sildenafil (Viagra and generic versions) - commonly used for as-needed dosing; usual strengths include 25 mg, 50 mg and 100 mg.
- Vardenafil (Levitra and generics) - similar profile to sildenafil for many users.
- Spedra - the Avanafil brand - marketed as a faster-onset option for some patients.
- Tadalafil (Cialis and generics) - longer duration of action; licensed options include daily low doses (2.5 mg, 5 mg) and as-needed 10 mg or each tablet holds 20 mg. Also used for BPH symptoms in selected patients.
For pulmonary arterial hypertension, different specialist-prescribed preparations and dosing are used. Products sold under alternative brand names such as Cialis Black, especially those claiming extremely high strengths, are often unlicensed or counterfeit and may contain incorrect amounts of active ingredient or contaminants. Treat such items with caution.
Prices for the UK market - Rough Comparison
Private retail prices vary according to brand, strength, pack size and pharmacy. The following are approximate per tablet estimates in GBP:
- Generic tadalafil 10 mg or 20 mg: approximately 1.00 to 3.00 per tablet.
- Brand Cialis 10 mg or 20 mg: around 5.00 to 12.00 per tablet.
- Daily low-dose tadalafil (2.5 mg or 5 mg): roughly 0.70 to 2.00 per tablet when purchased in larger packs.
- Generic sildenafil 50 mg or 100 mg: about 0.20 to 1.00 per tablet.
- Vardenafil 10 mg or 20 mg: about 2.00 to 6.00 per tablet.
- Avanafil 50 mg to 200 mg: roughly 3.00 to 8.00 per tablet.
These figures are indicative and exclude any consultation fees. NHS availability for ED medicines is limited and is controlled by local prescribing policies; many people access these treatments privately.
Juridical Status and Buying Safely in the UK
- Tadalafil is a Prescription Only Medicine (POM) under the Human Medicines Regulations 2012. A valid UK prescription from an authorised prescriber is required for legal supply.
- Dispensing must be carried out by a registered pharmacy. For online purchases, confirm that the pharmacy is registered with the General Pharmaceutical Council (GPhC) and that any prescriber is authorised in the UK. Use public registers from the GPhC together with the Medicines and Healthcare products Regulatory Agency (MHRA) to verify credentials.
- Importing prescription medicines is controlled. Unauthorised imports or purchases from unregulated websites risk seizure by border authorities and expose users to falsified or contaminated products.
- There is no UK licence for an 800 mg tadalafil tablet. Items sold as "Cialis Black" or with similarly extreme strength claims are unlikely to be lawful or safe and may carry criminal and health risks.
- To obtain ED medicines lawfully you must be aged 18 or older and complete an appropriate clinical assessment, either in person or via an approved online service.
Safer purchase guidance: obtain a prescription after a proper clinical consultation, buy only from registered UK pharmacies, and avoid suppliers that do not ask for clinical information or refuse to provide verifiable registration details.
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