Guide to Sildenafil Dosage- Different Dosages of Sildenafil for Treating ED

Sildenafil is an oral medicine used for the treatment of Erectile Dysfunction in men or assigned males at birth (AMAB).

It helps increase the blood flow to the penile region to get an erection during sexual intercourse.

Sildenafil is the generic name for Viagra, a med used for treating ED. 

It is also sold under the brand Revatio to treat Pulmonary Arterial Hypertension.

Viagra is available in three doses, 25mg, 50mg, and 100mg. Whereas Generic Viagra is available in 25mg, 50mg, 100mg, 120mg, 150mg, and 200mg.

A key point to note is both Viagra and Generic Viagra contain the same active ingredient, Sildenafil. 

But is there a recommended dosage of Sildenafil for a particular individual?

Let us look into the Sildenafil dosage available, the side effects, and the recommended Sildenafil dosage. 

Types of Sildenafil dosage for Erectile Dysfunction

What is Sildenafil?Source: Getty-images

Sildenafil is available in different dosages to treat ED. 

It is available in 25mg, 50mg, and 100mg of dosages.

The dosage of Sildenafil depends on the severity of the impotence. 

Let’s understand each dosage of Sildenafil separately.

Sildenafil 25mg

It is the minimum dosage of Sildenafil that is approved to treat ED. 

It is mainly prescribed to –

  • Individuals who have mild Erectile Dysfunction,
  • People who are old or have a health condition that may make them sensitive to the medication.

Sildenafil 50mg

It’s the most common dosage prescribed to manage Erectile Dysfunction.

Many individuals have found the dosage most effective for achieving an erection. 

According to a study, 71% of men achieved erection within 30 minutes of taking Sildenafil 50mg. 

Sildenafil 100mg

It is the maximum dosage of Sildenafil recommended to treat Erectile Dysfunction

The 100 mg dosage of Sildenafil is prescribed for- 

  • People with severe Erectile Dysfunction. 
  • Individuals who are not seeing any benefits from the lower dosage of the medication.

Sildenafil is also a key ingredient in Generic Viagra medicines like Fildena, Cenforce, etc.  Generic Viagra is also available in higher-strength dosages of 120mg, 150mg, and 200mg.

According to a study published, 50mg and 100mg of Sildenafil are the most effective dosages to treat impotence.

The dosage prescribed will vary for each individual with Erectile Dysfunction.

According to Mayo Clinic, the information below will give you a brief idea of the recommended dosage of Sildenafil. 

  • Aged 65 years and above- The individual should take a single dose of 25mg only once a day. The medicine should be taken 30 minutes to an hour before sexual intercourse. 
  • Aged up to 65 years- Should consume a 50mg dosage only once a day. The ED med can be taken 30 minutes to an hour before sexual intercourse. 
  • Anyone below the age of 18 should not take Sildenafil.
You should always consult a doctor for an adequate dosage to manage ED.

Who can consume Sildenafil

FDA approves individuals who are aged above 18 years to take Sildenafil to treat Erectile Dysfunction.

However, as this is a prescription-based medicine, it is essential to consult a healthcare provider before consuming this medicine.

Sildenafil may not be suitable for you if you have any of the following conditions:

  • Experienced an allergic response to Sildenafil or any medication.
  • Take medications for chest pain like Nitrates.
  • Either have liver or cardiac issues.
  • Low Blood Pressure.

Side Effects of Sildenafil

viagra headacheSource: pixelshot

It is generally considered safe to consume Sildenafil. It can, however, cause side effects, just like any other medication.

Some of the common side effects of the medicine are-

  • Headaches
  • Upset stomach
  • Fever
  • Nausea
  • Vomiting
  • Sore throat
  • Runny nose

In rare cases, there can be severe side effects of Sildenafil, such as-

  • Blurry vision or sudden vision loss
  • Sudden hearing loss
  • Chest pain
  • Fainting
  • Dizziness
  • Trouble in speaking
Please consult your doctor immediately if you experience any severe side effects of Sildenafil.


Sildenafil helps in treating ED.

Sildenafil is the active ingredient in Viagra.

Sildenafil dosage is available in 25mg, 50mg, and 100mg to treat ED.

50mg dosage of Sildenafil is the most prescribed dosage.

The Sildenafil dosage depends on various factors.

Most people aged above 18 can take Sildenafil to treat Erectile Dysfunction.

Headache, nausea, and sore throat are common side effects of Sildenafil. 

Frequently Asked Questions

Can you take 2 Sildenafil pills at once?

No, it is not recommended to take two Sildenafil tablets at once. Consuming more than the advised amount of Sildenafil dosage might raise the risk of side effects.

How long does Sildenafil last?

The effects of Sildenafil vary in individuals. But usually, the effect lasts up to 4 to 6 hours. 

Is Sildenafil weaker than Viagra? 

There is no difference between Sildenafil and Viagra. Sildenafil is the active ingredient in Viagra. 

Can I take Sildenafil if I don’t have ED?

Sildenafil does not help with erection for people who don’t have Erectile Dysfunction. However, according to a study, Sildenafil can help reduce Postorgasmic Refractory Time. Do not consume Sildenafil without consulting a doctor.

Is 100 mg of Sildenafil safe?

Yes, 100mg of Sildenafil is safe to consume. You should consult a doctor for effective ED medication if this dosage is inadequate. 

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Jim Carson is a highly skilled and dedicated medical writer passionate about advancing medical practice. With years of experience in the field of medical sciences, Jim has made significant contributions to various studies aimed at improving healthcare outcomes. He currently writes for, providing expert insights and knowledge on various topics. Jim's expertise extends to various areas, including drug interactions, dosages, side effects, and best practices for medication use. In Los Angeles, Jim lives with his loving wife, children, and beloved pets. He deeply values spending time with his family and cherishes their presence. When he's not writing, Jim enjoys watching football games and staying updated with the latest sports news. Jim's writing shines through his commitment to advancing medical practice and improving healthcare outcomes. Readers can trust Jim's articles to be informative, accurate, and reliable, making him a trusted pharmaceutical information source for the website's audience.