Quick answer: Tadalafil is a prescription medicine used for erectile dysfunction and certain other medical conditions. For ED, it can support an erectile response for up to 36 hours in some patients, but sexual stimulation is still required. It must never be combined with nitrate medicines.
What Is Tadalafil?
Tadalafil is a phosphodiesterase type 5 inhibitor, commonly abbreviated as a PDE5 inhibitor. It temporarily reduces the activity of the PDE5 enzyme and supports blood-vessel relaxation.
For erectile dysfunction, this action helps improve blood flow to the penis during sexual stimulation. Taking tadalafil alone does not automatically produce an erection.
Tadalafil does not:
- Automatically cause an erection
- Directly increase sexual desire
- Increase testosterone
- Permanently cure erectile dysfunction
- Guarantee the same response for every patient
- Protect against sexually transmitted infections
What Are the Main Tadalafil Uses?
1. Erectile Dysfunction
Tadalafil is widely prescribed for erectile dysfunction in adult men. Erectile dysfunction, or ED, refers to recurring difficulty achieving or maintaining an erection firm enough for sexual activity.
During sexual stimulation, tadalafil supports the body’s natural erectile process by improving blood flow. Its longer treatment window may provide greater flexibility compared with shorter-acting ED medicines.
For a complete overview of causes and treatment approaches, read our Erectile Dysfunction Treatment in Pakistan guide.
2. Benign Prostatic Hyperplasia
Certain lower-strength tadalafil formulations may be prescribed for symptoms of benign prostatic hyperplasia, commonly called BPH or an enlarged prostate.
BPH symptoms can include:
- Difficulty starting urination
- A weak urine stream
- Frequent need to urinate
- Urgent need to urinate
- Waking repeatedly at night to urinate
- A feeling that the bladder has not fully emptied
These symptoms can have several causes and should be medically assessed. Tadalafil must not be used to self-diagnose or self-treat prostate symptoms.
3. Erectile Dysfunction With BPH
A doctor may prescribe an appropriate tadalafil regimen to a suitable patient who experiences both erectile dysfunction and symptoms of benign prostatic hyperplasia.
The treatment plan should consider blood pressure, prostate medicines, kidney and liver function and other existing health conditions.
4. Pulmonary Arterial Hypertension
Special tadalafil formulations may be prescribed for pulmonary arterial hypertension, a condition involving high pressure in the blood vessels supplying the lungs.
The brand, strength and schedule used for pulmonary arterial hypertension differ from treatment for erectile dysfunction. ED products should not be used for pulmonary hypertension unless specifically prescribed by an appropriate specialist.
Important: Do not combine tadalafil prescribed for erectile dysfunction with another tadalafil-containing medicine prescribed for pulmonary hypertension. Different brand names may contain the same active ingredient.
For information about longer-duration ED treatment, available strengths and daily treatment options, read our Tadalafil Uses, Duration and Safety Guide.
How Does Tadalafil Work for Erectile Dysfunction?
During sexual stimulation, nitric oxide is released naturally in the body. This increases levels of cyclic guanosine monophosphate, or cGMP, which helps smooth muscles and blood vessels relax.
The PDE5 enzyme breaks down cGMP. By temporarily reducing PDE5 activity, tadalafil allows this natural erectile-response process to continue for longer.
Sexual stimulation remains essential. Tadalafil does not produce an erection in the absence of sexual arousal.
How Long Does Tadalafil Last?
Tadalafil may support an erectile response for up to 36 hours after a prescribed as-needed dose in some patients. The actual treatment window can vary according to strength, metabolism, health and other medicines.
Up to 36 hours does not mean a 36-hour erection. It means that sexual stimulation may produce an erectile response at different points during the treatment window.
An erection that continues for longer than four hours is a medical emergency and requires urgent treatment.
Available Tadalafil Strengths
Common tadalafil strengths include:
- Tadalafil 2.5mg
- Tadalafil 5mg
- Tadalafil 10mg
- Tadalafil 20mg
Not every strength is intended for the same schedule. Lower strengths may be prescribed for daily treatment, while 10mg or 20mg products are more commonly associated with as-needed treatment.
Tadalafil 2.5mg
Tadalafil 2.5mg may be prescribed as a lower once-daily treatment for erectile dysfunction in suitable patients. It should be taken only according to a consistent schedule provided by a doctor.
Tadalafil 5mg
Tadalafil 5mg may be prescribed once daily for erectile dysfunction, symptoms of BPH, or both conditions in suitable patients. Kidney function, liver function and other medicines must be considered.
Tadalafil 10mg
Official prescribing information identifies tadalafil 10mg as a commonly recommended starting strength for many suitable patients using it when required. This is general information and not a personalised recommendation.
Tadalafil 20mg
A doctor may consider tadalafil 20mg when a lower as-needed strength has been insufficient and well tolerated. Patients should not increase the strength themselves.
Daily Tadalafil vs As-Needed Tadalafil
| Feature | Daily Tadalafil | As-Needed Tadalafil |
|---|---|---|
| Common strengths | 2.5mg or 5mg | 10mg or 20mg |
| General schedule | Approximately the same time each day | Before anticipated sexual activity |
| Timing in relation to activity | Not directly timed around each occasion | Used according to prescribed pre-activity timing |
| Medical supervision | Required | Required |
| Sexual stimulation required | Yes | Yes |
A patient must not use a higher as-needed tablet as a daily treatment unless a doctor has specifically prescribed that strength and schedule.
When Is Tadalafil Taken?
Some patients using tadalafil when required may be instructed to take it at least 30 minutes before anticipated sexual activity. Its longer treatment window means precise timing may be less restrictive than with sildenafil.
Patients using a once-daily regimen are generally instructed to take the prescribed tablet at approximately the same time each day, regardless of the timing of sexual activity.
Do not take additional tadalafil because sexual activity did not occur during the treatment window.
Can Tadalafil Be Taken With Food?
Tadalafil can generally be taken with or without food. Unlike sildenafil, a heavy meal usually has less influence on tadalafil absorption.
Always check the information supplied with the specific product because its inactive ingredients and manufacturer instructions may differ.
Tadalafil and Alcohol
Alcohol and tadalafil can both contribute to lower blood pressure. Excessive alcohol may increase:
- Dizziness
- Light-headedness
- Headache
- Fainting risk
- Difficulty achieving an erection
A patient with low blood pressure, heart disease or blood-pressure treatment should obtain personalised medical advice.
Tadalafil and Grapefruit
Grapefruit or grapefruit juice may affect the way tadalafil is processed and can increase the risk of side effects. Patients should follow their doctor’s or pharmacist’s advice regarding grapefruit products.
Common Tadalafil Side Effects
Like all medicines, tadalafil can cause side effects, although not every patient experiences them.
Commonly reported side effects include:
- Headache
- Indigestion or upset stomach
- Facial flushing
- Blocked or stuffy nose
- Dizziness
- Back pain
- Muscle aches
- Pain in the arms or legs
Muscle or back discomfort associated with tadalafil may begin several hours after use. Consult a healthcare professional if a side effect is severe, persistent or concerning.
Serious Tadalafil Side Effects
Seek urgent medical assistance if tadalafil is followed by:
- Chest pain or severe pressure in the chest
- Fainting or severe dizziness
- An erection lasting longer than four hours
- Sudden reduction or loss of vision
- Sudden reduction or loss of hearing
- Difficulty breathing
- Swelling of the face, lips, tongue or throat
- Signs of a severe allergic reaction
If chest pain occurs during or after sexual activity, stop the activity and seek medical assistance. Inform the emergency team that tadalafil was used and approximately when it was taken.
Tadalafil and Nitrates
Critical safety warning: Tadalafil must never be combined with nitrate medicines or recreational “poppers.” This combination can cause a sudden and potentially dangerous fall in blood pressure.
Nitrate medicines include:
- Nitroglycerin
- Glyceryl trinitrate or GTN
- Isosorbide mononitrate
- Isosorbide dinitrate
- Amyl nitrate or amyl nitrite “poppers”
Because tadalafil remains active for longer, its interaction with nitrate medicines remains relevant for longer than sildenafil’s. Emergency medical professionals must be told when tadalafil was last taken.
Important Tadalafil Interactions
Tell your doctor about every prescription medicine, non-prescription product, vitamin and herbal supplement you use.
Particular caution may be required with:
- Riociguat
- Alpha-blockers such as doxazosin or tamsulosin
- Other blood-pressure medicines
- Certain antifungal medicines
- Certain antibiotics
- Some HIV treatments
- Other PDE5 inhibitors or ED medicines
- Other medicines containing tadalafil
- Unlabelled sexual-enhancement supplements
Alpha-blockers and tadalafil can both lower blood pressure. A doctor may need to review the patient’s stability, strength and treatment schedule before they are used together.
Who Should Obtain Medical Advice Before Tadalafil?
Medical assessment is particularly important if you:
- Have heart disease, chest pain or heart failure
- Recently experienced a heart attack or stroke
- Have very low or uncontrolled high blood pressure
- Have severe liver or kidney disease
- Receive kidney dialysis
- Have a bleeding disorder or active stomach ulcer
- Have a history of sudden vision or hearing loss
- Have a penile deformity
- Previously experienced a prolonged erection
- Have sickle-cell anaemia, leukaemia or multiple myeloma
Sexual activity can place additional strain on the cardiovascular system. Patients with heart disease may require assessment before ED treatment.
Why Might Tadalafil Not Work as Expected?
A reduced response can have several explanations:
- Insufficient sexual stimulation
- Incorrect timing or schedule
- Excessive alcohol consumption
- Performance anxiety
- An unsuitable prescribed strength
- A significant underlying health condition
- Medicine interactions
- An unregistered or falsified product
Do not take an additional dose or increase the strength yourself. A doctor can review the treatment technique, schedule and underlying causes.
Tadalafil vs Sildenafil
Tadalafil and sildenafil belong to the same medicine class but differ in duration, food effects and possible treatment schedules.
Tadalafil may remain effective for up to 36 hours and may be prescribed in a lower daily regimen. Sildenafil generally has a shorter treatment window and may be more affected by a heavy meal.
For a detailed comparison, read our Sildenafil vs Tadalafil guide. You can also review our guide covering Sildenafil Uses, Timing and Side Effects.
Tadalafil Brands and Products in Pakistan
Tadalafil may be available under brand names such as Cialis, Tadalis and other generic products. Availability, manufacturer, strength and pack size can vary.
Before selecting any product, confirm:
- The active ingredient is tadalafil
- The strength per tablet
- The manufacturer and packaging information
- The pack size
- The batch and expiry details
- The prescribed schedule
Browse currently available options in the Erectile Dysfunction medicines category.
Fake and Unregistered Tadalafil Products
DRAP has issued safety alerts concerning falsified and spurious Cialis products. Counterfeit or unregistered products may contain an incorrect strength, undeclared ingredients, harmful substances or no active medicine.
Avoid:
- Loose or unlabelled tablets
- Opened or altered packaging
- Packs without clear batch and expiry details
- Products making “100% safe” claims
- Unknown social-media sellers
- Products without manufacturer information
If a product appears suspicious, do not use it. Check current DRAP safety alerts and consult a pharmacist.
Frequently Asked Questions
What is tadalafil mainly used for?
Tadalafil is mainly prescribed for erectile dysfunction. Certain formulations may also be used for symptoms of benign prostatic hyperplasia or pulmonary arterial hypertension.
How long does tadalafil last?
An as-needed dose may support an erectile response for up to 36 hours in some patients. This does not mean an erection continues throughout that period.
Does tadalafil work without sexual stimulation?
No. Sexual stimulation is required for tadalafil to support an erectile response.
Can tadalafil be taken every day?
Lower strengths such as 2.5mg or 5mg may be prescribed once daily for suitable patients. Daily treatment should not be started without medical supervision.
Is tadalafil 20mg suitable for daily use?
Tadalafil 20mg is generally associated with as-needed treatment rather than a routine daily schedule. Use only the strength and frequency prescribed by a doctor.
Can tadalafil be taken with food?
Tadalafil can generally be taken with or without food. Food usually has less influence on its absorption than it does with sildenafil.
Is Tadalis the same as tadalafil?
Tadalis products are generally associated with tadalafil. Always confirm the active ingredient and strength printed on the product packaging.
Is Cialis the same as tadalafil?
Cialis is an original brand containing tadalafil. Generic and other branded products may contain the same active ingredient but differ in manufacturer and inactive ingredients.
Can tadalafil and sildenafil be taken together?
They should not be combined unless specifically prescribed and supervised by an appropriate specialist. Combining ED medicines may increase blood-pressure and side-effect risks.
Can heart patients use tadalafil?
Some heart patients may be unsuitable for tadalafil. Anyone taking nitrate medicine must not use it. A cardiovascular assessment may be required before treatment.
Does tadalafil increase sexual desire?
No. Tadalafil supports blood flow during sexual stimulation but does not directly increase libido.
Reviewed Sources
- Official tadalafil prescribing information
- NHS tadalafil medicine information
- NHS nitrate interaction information
- DRAP falsified Cialis alert
Medical Disclaimer: This article provides general educational information and does not replace medical advice, diagnosis or treatment. Tadalafil is a prescription medicine and should only be used after assessment by a registered healthcare professional.