Sildenafil vs Tadalafil: Which ED Medicine Is Different and How?

What Are Sildenafil and Tadalafil?

Sildenafil and tadalafil are prescription medicines belonging to a group called phosphodiesterase type 5 inhibitors, commonly known as PDE5 inhibitors. They are frequently prescribed for erectile dysfunction in adult men.

Erectile dysfunction is the recurring difficulty in achieving or maintaining an erection firm enough for sexual activity. PDE5 inhibitors support the body’s natural erectile response by helping blood vessels relax and improving blood flow to the penis during sexual stimulation.

These medicines:

• Do not automatically produce an erection
• Require sexual stimulation to work
• Do not directly increase sexual desire
• Do not permanently cure erectile dysfunction
• Do not protect against sexually transmitted infections

For a broader explanation of causes and available treatment approaches, read our erectile dysfunction treatment in Pakistan guide.

Sildenafil vs Tadalafil Comparison Table

Important: Timings are general prescribing-information ranges, not personal dosing instructions. Follow the directions given by your doctor and the leaflet supplied with the medicine.

How Does Sildenafil Work?

Sildenafil temporarily reduces the activity of the PDE5 enzyme. During sexual stimulation, this action supports the natural chemical process that relaxes blood vessels and improves blood flow to the penis.

Sildenafil is generally used when required rather than as a continuous ED treatment. Official prescribing information states that it may be taken between 30 minutes and four hours before anticipated sexual activity, although approximately one hour before activity is commonly recommended for many patients.

The medicine must not be taken more frequently or at a higher strength than prescribed.

How Does Tadalafil Work?

Tadalafil works through the same general PDE5 pathway but remains active in the body for longer. Its effects may support erectile response for up to 36 hours after a dose in some patients.

This does not mean that an erection continues for 36 hours. It means that sexual stimulation may produce an erectile response at different points within the treatment window.

Tadalafil may be prescribed:

• When required before anticipated sexual activity
• As a lower once-daily dose for suitable patients

A once-daily tadalafil plan should only be started after medical assessment. It does not mean that higher tadalafil strengths should be taken every day.

Which Medicine Works Faster?

Both medicines may begin supporting an erectile response within a similar general timeframe. Sildenafil is commonly taken approximately one hour before anticipated activity, while some tadalafil patients are instructed to take their medicine at least 30 minutes beforehand.

Actual onset can vary because of:

• The prescribed strength
• Whether sildenafil was taken after a heavy meal
• Individual metabolism
• Existing medical conditions
• Other medicines being used
• Level of sexual stimulation
• Stress or performance anxiety

A medicine taking longer than expected does not mean another dose should immediately be taken.

Which Medicine Lasts Longer?

Tadalafil has the longer potential treatment window. Its effects may remain available for up to 36 hours. Sildenafil has a shorter treatment window and is generally associated with more specifically planned use.

“Longer lasting” should not be confused with being stronger or more effective. Some patients may prefer sildenafil’s shorter window, while others may prefer tadalafil’s flexibility. Individual response and side effects remain important.

Food and Alcohol Differences

Sildenafil and Food

Sildenafil can be taken with or without food. However, a large or high-fat meal may delay absorption, meaning the medicine can take longer to begin working.

Tadalafil and Food

Tadalafil can generally be taken with or without food, and food usually has less influence on its absorption.

Alcohol

Excessive alcohol may make it more difficult to achieve an erection and can increase dizziness, headache or low blood pressure. Combining large amounts of alcohol with either medicine may reduce the overall treatment experience and increase risk.

Sildenafil vs Tadalafil Side Effects

Both medicines can cause side effects, although not every patient experiences them.

Side Effects Associated With Both

• Headache
• Facial flushing
• Indigestion
• Stuffy or runny nose
• Dizziness
• Nausea

Side Effects More Commonly Associated With Sildenafil

• Temporary visual changes
• Blurred vision
• Changes in colour perception

Side Effects More Commonly Associated With Tadalafil

• Back pain
• Muscle aches
• Pain in the arms or legs

Side effects that persist, worsen or interfere with normal activities should be discussed with a doctor or pharmacist.

Serious Warning Signs

Stop sexual activity and seek urgent medical assistance if either medicine 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 or a severe allergic reaction

If chest pain occurs after using sildenafil or tadalafil, tell the emergency medical team which medicine was taken and approximately when it was used. Do not take a nitrate medicine for chest pain unless instructed by a medical professional who knows that a PDE5 inhibitor has been used.

The Nitrate Interaction

Nitrates may be supplied as tablets, sprays, patches, ointments or medicines placed under the tongue. Recreational “poppers” can also contain nitrates and must not be combined with ED medicines.

Other Medicine Interactions

Tell your doctor about all medicines and supplements you use, particularly:

• Alpha-blockers used for blood pressure or prostate symptoms
• Other blood-pressure medicines
• Riociguat
• Certain antifungal medicines
• Certain antibiotics
• Some HIV treatments
• Other erectile dysfunction medicines
• Unlabelled herbal sexual-enhancement products

Do not combine sildenafil with tadalafil or take two different branded ED products without checking their active ingredients.

Who May Require Extra Medical Assessment?

Professional assessment is especially important for patients who:

• Have heart disease or experience chest pain
• Recently experienced a heart attack or stroke
• Have very low or uncontrolled high blood pressure
• Have severe liver or kidney problems
• Have a bleeding disorder or active stomach ulcer
• Have a history of sudden vision or hearing loss
• Have a penile deformity
• Have sickle-cell disease, leukaemia or multiple myeloma

Sildenafil vs Tadalafil for Planned Activity

Sildenafil’s shorter treatment window may suit a patient who prefers planned, occasional treatment and does not require a daily option. However, food timing may need to be considered.

This does not make sildenafil medically safer or more effective for everyone. Suitability must still be assessed according to cardiovascular health, other medicines and individual response.

Sildenafil vs Tadalafil for Greater Flexibility

Tadalafil’s longer potential window may suit a patient who prefers less precise timing. A doctor may also consider a lower daily regimen for certain suitable patients.

The longer duration also means that interactions and side effects may remain relevant for longer. Patients should not take additional ED medicine simply because sexual activity did not occur after the first dose.

Viagra vs Cialis

Viagra is an original brand containing sildenafil, while Cialis is an original brand containing tadalafil. Comparing Viagra with Cialis is therefore mainly a comparison between their respective active ingredients.

Brand availability, manufacturer, packaging and price can differ between countries and sellers. Always confirm the active ingredient and strength printed on the physical pack.

Silagro vs Tadalis

Silagro products are associated with sildenafil, whereas Tadalis products are generally associated with tadalafil. Their treatment characteristics are therefore based primarily on these different active ingredients.

Check each individual product page and packaging for:

• Active ingredient
• Medicine strength
• Manufacturer
• Pack size
• Batch and expiry details
• Storage instructions

Do not assume that a product is appropriate simply because it has previously been used by someone else.

Which Is Better: Sildenafil or Tadalafil?

Neither medicine can be described as universally better. The decision may depend on:

• Preferred treatment window
• Frequency of anticipated activity
• Food and timing preferences
• Previous response to treatment
• Side-effect experience
• Existing medical conditions
• Possible medicine interactions
• Doctor’s recommendation

Higher strength does not necessarily produce a better result. The lowest appropriate effective strength is determined by a healthcare professional according to response and tolerability.

Explore Available ED Products

HomeoShop.PK displays available sildenafil and tadalafil products with their respective strengths, pack sizes and product information. Visit the Erectile Dysfunction medicines category to view currently listed options.

Prescription or pharmacist verification may be required before an order is processed. Product availability and delivery remain subject to applicable Pakistani laws, pharmacy requirements and current stock.

Frequently Asked Questions

Is tadalafil stronger than sildenafil?

Not necessarily. Tadalafil remains active for longer, but longer duration does not mean greater strength or better effectiveness for every patient.

Can sildenafil and tadalafil be taken together?

They should not be combined unless specifically prescribed and supervised by an appropriate specialist. Combining ED medicines can increase side-effect and blood-pressure risks.

Which medicine works for up to 36 hours?

Tadalafil may support an erectile response for up to 36 hours in some patients. Sexual stimulation is still required, and this does not mean an erection lasts for 36 hours.

Which medicine is affected more by food?

A heavy or high-fat meal may delay sildenafil’s effect. Food generally has less influence on tadalafil absorption.

Can tadalafil be taken every day?

Certain lower tadalafil strengths may be prescribed once daily for suitable patients. Daily use should not be started without a doctor’s instructions.

Can sildenafil be taken every day?

Sildenafil should only be used according to the prescribed frequency. Do not take more than one dose in 24 hours, and do not begin regular daily use without medical advice.

Do sildenafil and tadalafil increase libido?

No. They support blood flow during sexual stimulation but do not directly increase sexual desire.

Can heart patients use sildenafil or tadalafil?

Some heart patients may be unsuitable for either medicine. Anyone taking nitrates must not use them. A doctor should assess cardiovascular safety before treatment.

Where can I compare sildenafil and tadalafil products in Pakistan?

Available sildenafil and tadalafil products can be viewed in the HomeoShop.PK Erectile Dysfunction category. Compare active ingredients, strengths and pack sizes rather than relying only on brand names.

Reviewed Sources

• Official Viagra prescribing information
• Official Cialis prescribing information
• NHS sildenafil information
• NHS tadalafil information