Pka value of sildenafil citrate

Sildenafil citrate, commonly known by the brand name, is a prescription-only medicine used to treat erectile dysfunction (ED) in adult men. It works by improving blood flow to the penis, helping to achieve and maintain an erection during sexual activity.

Dosage and Administration

Sildenafil is available in 25mg, 50mg, and 100mg strengths.

  • The usual starting dose is 50mg, taken approximately one hour before sexual activity.
  • Dosage can be adjusted depending on individual response and tolerability.
  • Take only one tablet in 24 hours, with or without food.
  • Avoid grapefruit juice, as it can increase the risk of side effects.
  • A high-fat meal may delay onset of action.

Effectiveness

Sildenafil has been shown to be effective in up to 80% of men with ED, with effects typically noticeable within 30 to 60 minutes, and lasting for up to 4–5 hours.

Side Effects

Common side effects include:

  • Headache
  • Flushing
  • Nasal congestion
  • Indigestion

Less common but serious effects include visual disturbances, hearing changes, or prolonged erections. Seek medical attention if severe or persistent side effects occur.

Contraindications

Sildenafil should not be used by those:

  • Taking nitrates for chest pain
  • With severe heart or liver conditions
  • Under 18 years of age
  • With certain medication interactions (e.g. alpha-blockers, antifungals, antibiotics)

Interactions

Inform your doctor of all medications and supplements before use. Interactions may occur with:

  • Nitrates
  • Alpha-blockers
  • Some antibiotics and antifungal medicines

Alcohol and Heart Conditions

Avoid excessive alcohol while taking sildenafil, as it can lower blood pressure and increase side effect risk. Use with caution if you have any heart-related conditions.

Availability and Cost

Sildenafil is available by prescription only in the UK.

  • Generic versions are more affordable than branded Viagra.
  • Supplied by licensed UK pharmacies such as Online Chemist.
  • Avoid counterfeit products from unregulated websites.

Take Control of Your Sex Life

Don’t let ED affect your confidence or relationships. Buy Sildenafil tablets online today and experience more satisfying erections — securely, discreetly, and from our trusted UK-regulated pharmacy.

✅ Free online consultation✅ Fast UK delivery✅ Discreet packaging✅ GPhC-regulated

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Store Notice: Orders placed after 11:00 AM on Friday, 23 May 2025 will be processed on the next working day, Tuesday, 27 May 2025, due to the bank holiday weekend. Thank you for your understanding.

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  • Thank you for shopping at Superdrug! You a roleSerious side effectsSerious side effects: Loss of vision, hearing changes, and prolonged erections
  • Serious side effects: Loss of vision, hearing changes, and prolonged erections
  • Serious side effects: Long-lasting effects, sudden onset of symptoms, and chest pain

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Sildenafil citrate, commonly known by the brand name, is a prescription-only medicine used to treat erectile dysfunction (ED) in adult men. It works by improving blood flow to the penis, helping to achieve and maintain an erection during sexual activity.

Dosage and Administration

Sildenafil is available in 25mg, 50mg, and 100mg strengths.

  • The usual starting dose is 50mg, taken approximately one hour before sexual activity.
  • Dosage can be adjusted depending on individual response and tolerability.
  • Take only one tablet in 24 hours, with or without food.
  • Avoid grapefruit juice, as it can increase the risk of side effects.
  • A high-fat meal may delay onset of action.

Effectiveness

Sildenafil has been shown to be effective in up to 80% of men with ED, with effects typically noticeable within 30 to 60 minutes, and lasting for up to 4–5 hours.

Side Effects

Common side effects include:

  • Headache
  • Flushing
  • Nasal congestion
  • Indigestion

Less common but serious effects include visual disturbances, hearing changes, or prolonged erections. Seek medical attention if severe or persistent side effects occur.

Contraindications

Sildenafil should not be used by those:

  • Taking nitrates for chest pain
  • With severe heart or liver conditions
  • Under 18 years of age
  • With certain medication interactions (e.g. alpha-blockers, antifungals, antibiotics)

Interactions

Inform your doctor of all medications and supplements before use. Interactions may occur with:

  • Nitrates
  • Alpha-blockers
  • Some antibiotics and antifungal medicines

Alcohol and Heart Conditions

Avoid excessive alcohol while taking sildenafil, as it can lower blood pressure and increase side effect risk. Use with caution if you have any heart-related conditions.

Availability and Cost

Sildenafil is available by prescription only in the UK.

  • Generic versions are more affordable than branded Viagra.
  • Supplied by licensed UK pharmacies such as Online Chemist.
  • Avoid counterfeit products from unregulated websites.

Take Control of Your Sex Life

Don’t let ED affect your confidence or relationships. Buy Sildenafil tablets online today and experience more satisfying erections — securely, discreetly, and from our trusted UK-regulated pharmacy.

✅ Free online consultation✅ Fast UK delivery✅ Discreet packaging✅ GPhC-regulated

now and get back to enjoying intimacy with confidence.

Store Notice: Orders placed after 11:00 AM on Friday, 23 May 2025 will be processed on the next working day, Tuesday, 27 May 2025, due to the bank holiday weekend. Thank you for your understanding.

Product WarningConsultation

Our doctors will determine when this medication is right for you. Please consult your GP first. We use best UK services, but the pharmacy...

Sildenafil is available by prescription only. We use best UK services, but the pharmacy will...

Advantages

  • All patients...you will be given a choice. Viagra or generic Sildenafil will be given by the prescribing doctor. You...
  • You will...

Sildenafil citrate, commonly known by the brand name, is a prescription-only medicine used to treat erectile dysfunction (ED) in adult men. It works by improving blood flow to the penis, helping to achieve and maintain an erection during sexual activity.

Dosage and Administration

Sildenafil is available in 25mg, 50mg, and 100mg strengths.

  • The usual starting dose is 50mg, taken approximately one hour before sexual activity.
  • Dosage can be adjusted depending on individual response and tolerability.
  • Take only one tablet in 24 hours, with or without food.
  • Avoid grapefruit juice, as it can increase the risk of side effects.
  • A high-fat meal may delay onset of action.

Effectiveness

Sildenafil has been shown to be effective in up to 80% of men with ED, with effects typically noticeable within 30 to 60 minutes, and lasting for up to 4–5 hours.

Side Effects

Common side effects include:

  • Headache
  • Flushing
  • Nasal congestion
  • Indigestion

Less common but serious effects include visual disturbances, hearing changes, or prolonged erections. Seek medical attention if severe or persistent side effects occur.

Contraindications

Sildenafil should not be used by those:

  • Taking nitrates for chest pain
  • With severe heart or liver conditions
  • Under 18 years of age
  • With certain medication interactions (e.g. alpha-blockers, antifungals, antibiotics)

Interactions

Inform your doctor of all medications and supplements before use. Interactions may occur with:

  • Nitrates
  • Alpha-blockers
  • Some antibiotics and antifungal medicines

Alcohol and Heart Conditions

Avoid excessive alcohol while taking sildenafil, as it can lower blood pressure and increase side effect risk. Use with caution if you have any heart-related conditions.

Availability and Cost

Sildenafil is available by prescription only in the UK.

  • Generic versions are more affordable than branded Viagra.
  • Supplied by licensed UK pharmacies such as Online Chemist.
  • Avoid counterfeit products from unregulated websites.

Take Control of Your Sex Life

Don’t let ED affect your confidence or relationships. Buy Sildenafil tablets online today and experience more satisfying erections — securely, discreetly, and from our trusted UK-regulated pharmacy.

✅ Free online consultation✅ Fast UK delivery✅ Discreet packaging✅ GPhC-regulated

now and get back to enjoying intimacy with confidence.

Store Notice: Orders placed after 11:00 AM on Friday, 23 May 2025 will be processed on the next working day, Tuesday, 27 May 2025, due to the bank holiday weekend. Thank you for your understanding.

Read More Read Less

Sildenafil can cause side effects, but some them include:

  • Headache or dizziness.
  • Flushing.
  • Indigestion.
  • Mild vision changes.
  • Nasal congestion.
  • Temporary erections are also...

Some side effects are more likely if you:

  • Have heart problems such as heart failure or uncontrolled irregular heartbeats.
  • Have had heart attack or stroke in the past. To avoid sudden vision loss, continue to use your medicine even after a stroke.
  • Have had a heart attack within the last two months.
  • Have blood clots of any type. Prolonged or direct use of sildenafil can increase the risk of...
  • Have a weakened immune system.

Description

Sildenafil Citrate Powder, 100 mg per 1 L, is used to treat erectile dysfunction (ED) in men. It is also used for treating pulmonary arterial hypertension.

It is also used to treat pulmonary arterial hypertension (PAH).

Sildenafil Citrate powder contains the active ingredient, sildenafil citrate, which is a phosphodiesterase type 5 (PDE5) inhibitor. It works by relaxing the muscles in the blood vessels in the penis, allowing increased blood flow into the penis when sexually stimulated. It does this by blocking PDE5 enzymes, which are responsible for breaking down cyclic guanosine monophosphate (cGMP).

It is used in pulmonary arterial hypertension in men.

Active Ingredients

Sildenafil Citrate is a phosphodiesterase type 5 (PDE5) inhibitor. It is a phosphodiesterase type 5 inhibitor that helps relax blood vessels and widen blood vessels.

It is also used in pulmonary arterial hypertension in men.

The active ingredient in Sildenafil Citrate is sildenafil citrate. The active ingredient in this drug is the PDE5 inhibitor sildenafil citrate.

Sildenafil Citrate is used to treat erectile dysfunction (ED) in men. It is also used for pulmonary arterial hypertension (PAH).

How It Works

It is a phosphodiesterase type 5 inhibitor that relaxes the blood vessels and widens blood vessels.

It is a phosphodiesterase type 5 (PDE5) inhibitor that works by relaxing the blood vessels and dilating the blood vessels.

Safety

Sildenafil Citrate is considered safe for use in men.

It is not recommended to take Sildenafil Citrate if you are allergic to sildenafil or any other ingredients in this medication. Inform your doctor if you have any other medical condition.

Sildenafil Citrate should not be used by people who are taking nitrates, guanylate cyclase stimulators, alpha-blockers, antifungals, antibiotics, antifungals, antimalarials, antibiotics, antifungals, blood pressure medicines, antibiotics, antiretrovirals, or HIV medicines. Sildenafil Citrate may also interact with other medications.

Ingredients

Each tablet contains 100 mg of sildenafil citrate.

Sildenafil Citrate is not suitable for people with certain risk factors, such as:

People with a known hypersensitivity to sildenafil or any other ingredient in this medication.

People with a known hypersensitivity to any other PDE5 inhibitor, as well as those not prescribed this medication, may not be suitable for this medication.

Sildenafil Citrate is not suitable for people with a history of allergic reactions to other PDE5 inhibitors, such as erythroIREDALGIN, EDRENICAP, HERIDchemist^, LACTONE, PDE5-I, or VIAGRA.

Dosage

Sildenafil Citrate is recommended for use in the treatment of erectile dysfunction in men.

Viagra Online

Buy Viagra online in the UK. Sildenafil, the active ingredient in Viagra, works by relaxing the blood vessels in your penis. This allows blood to flow into your penis when you get sexually excited. When you take Viagra, it causes the erection to last longer and harder. Sildenafil is a prescription medication, so it is not suitable for everyone. It is important to note that Viagra is not suitable for everyone and is not suitable for everyone. Men who have heart conditions, such as those with a recent heart attack, may be at higher risk for heart attack and stroke. If you have heart conditions, your doctor may prescribe Viagra to treat the condition. Viagra is usually taken as needed, usually 30 minutes to 1 hour before sexual activity. It is important to note that Viagra can take up to 4 hours to work, so it is important to take it exactly as your doctor tells you. It is also important to be aware that taking Viagra can cause a severe allergic reaction and can lead to a life-threatening condition called priapism (erectile dysfunction). If you experience any side effects such as headache, nausea, facial flushing, indigestion, nasal congestion, dizziness, or vision changes, stop taking Viagra and seek medical attention immediately. The effects of Viagra can last for up to 4 hours. If you experience any side effects such as chest pain, shortness of breath, swelling of the ankles or feet, shortness of breath, or difficulty breathing, stop taking Viagra and seek medical attention immediately. Viagra can cause vision changes (such as blurred vision, loss of vision, or sensitivity to light) and can cause priapism.