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Viagra Vs Sildenafil: Meaning, Dosages and Differences Explained

Published: 05, Mar 2025 Last Updated: 07, Mar 2025
Viagra Vs Sildenafil: Meaning, Dosages and Differences Explained

Viagra might be the most well-known prescription medication for treating erectile dysfunction (ED), but it is not the only option. Its active ingredient, Sildenafil Citrate, is also available in a more affordable generic version and is simply known as Sildenafil. 

Viagra is a well-known brand that contains the molecule Sildenafil Citrate, offering various dosage options to meet individual needs. Doctors recommend the most appropriate dosage based on a patient's specific requirements. 

Understanding these differences can help you make an informed decision that aligns with your health and budget. Continue reading this blog to explore detailed insights into Sildenafil citrate including its dosage options, uses, potential side effects, and more.

What is Viagra? 

Viagra is a branded oral tablet used for the treatment of erectile dysfunction (ED). It was developed originally for heart conditions but was found effective later on for ED and received approval from the FDA in 1998. 

The active component of Viagra is Sildenafil Citrate, which improves blood flow to the penis. This increased blood flow circulation causes erection and maintains it during arousal. 

Viagra is available in three main dosages i.e. 25mg, 50mg and 100mg, allowing doctors to recommend the most suitable option based on individual needs. Typically, Viagra is taken orally 30 to 60 minutes before sexual activity, though it can start working in as little as 12 minutes for some users. 

The dosage impact usually lasts for four to six hours, although factors such as your age, metabolism, and overall health can influence its duration.

What is Sildenafil? 

Sildenafil citrate is the active molecule constituted in Viagra. It functions in the same way as Viagra and leaves the same effect on the body. Sildenafil functions by blocking the PDE5 enzyme, which helps relax blood vessels and improve blood flow.

Beyond treating ED, Sildenafil is also approved under the brand name Revatio by the FDA for the treatment of pulmonary arterial hypertension (PAH), a condition affecting the lungs. It helps improve exercise capacity in both men and women with PAH.

How are Viagra and Sildenafil Related? 

Viagra, consisting of the active molecule -Sildenafil,  is quite popular among individuals suffering from erectile dysfunction.

Sildenafil is a molecule manufactured and sold under various brand names, including Viagra, and leaves the same impact regardless of the branding. First introduced to the market in 2011, Sildenafil made it possible for other pharmaceutical companies to produce and sell a more affordable alternative to Viagra.

Both these medications can be bought through prescriptions. However, Pfizer has introduced Viagra Connect in certain countries, such as the UK, where it is available without a prescription.

What are the Side Effects of Viagra vs. Sildenafil? 

Since both Viagra and Sildenafil are similar, their side effects are also the same. It is important to be aware of these potential side effects and to seek medical advice if necessary.

Here is a list of common side effects of Viagra and Sildenafil:

  • Blocked nose

  • Headaches

  • Back and muscle pain

  • Nausea

  • Indigestion

  • Changes in vision (examples include, change in colour, mind blurring and others)

  • Facial flushing

However, all these side effects get resolved on their own once the medication effect is reduced. 

There are some rare and serious side effects of Viagra and Sildenafil. If you experience any of the following, seek medical attention immediately:

  • Loss of hearing

  • Loss of vision

  • Dizziness and lightheadedness (usually occurs due to a combination of low blood pressure and other medications)

  • Priapism (occurs when erection lasts for more than four hours which can be painful at times)

Consult a doctor if these severe side effects last longer and get worse with time. 

Viagra vs Sildenafil: What’s the Difference? 

Here are some key differences between Viagra and generic Sildenafil medications:

Features

Viagra

Sildenafil

Dosage

Viagra is available in three standard dosages: 25mg, 50mg, and 100mg.

Sildenafil offers the same options but also provides additional flexibility. Some manufacturers produce a 20mg version, which is sometimes prescribed in multiple tablets to adjust the dosage.

Manufacturer

Viagra is exclusively developed and manufactured by Pfizer, ensuring consistent formulation, branding, and quality control.

Sildenafil is produced by multiple pharmaceutical companies, which may lead to slight differences in non-medical ingredients such as binders, fillers, or colouring agents. However, these variations do not impact the effectiveness or safety of the medication.

Cost

Pfizer, the manufacturer of Viagra, is quite expensive mainly because of its brand recognition.

Sildenafil citrate is produced by multiple manufacturers, making it a more affordable alternative. This price difference often plays a key role in purchasing decisions.

Appearance

Viagra is most commonly recognised as the “little blue pill” in the market. The shape and colour of it are easily recognisable.

Sildenafil Citrate appearance varies across different manufacturers who produce it in different sizes, shapes, and colours. 

Viagra Vs Sildenafil: When to Choose? 

Choosing between Viagra and other medications with active ingredient Sildenafil, depends on your priorities, such as brand preference, cost, and flexibility. Let us explore in detail when to choose Viagra and Sildenafil. 

Choose Viagra if:

  • You Trust in Big Brands: Viagra is the original ED medication, developed by Pfizer, with a strong reputation for quality and reliability.

  • You Want Consistency: Irrespective of where you are purchasing Viagra, it is made the same way, ensuring you know exactly what to expect each time.

  • Cost is Not a Concern: If price is not an issue with you, Viagra may be the right choice for you.

Choose Generic Sildenafil if:

  • You Want to Save Money: Generic Sildenafil might be a cheaper alternative but it functions in the same manner.

  • Exploring Different Options: These medicines might appear different based on the manufacturer, but their effects remain the same.

  • Opt for Flexibility: As there are multiple manufacturing companies, you may find more dosage options, price variations, and different purchasing/shipping choices to fit your needs.

Viagra vs Sildenafil Dosage 

Both Viagra and generic medications with Sildenafil Citrate are widely used to treat erectile dysfunction (ED), but their dosage guidelines vary slightly. Understanding the correct dosage is crucial for safety, effectiveness, and minimising side effects.

  • Viagra Dosage

The three available dosages of Viagra tablets are:

  • 25 mg 

  • 50 mg

  • 100 mg

These are the most recommended dosages of Viagra. Make sure to take the dosage as prescribed by your doctor, based on your needs. Doctors typically start patients on a 50 mg dose, adjusting it based on individual response. If needed, the dose can be increased to 100 mg or lowered to 25 mg to manage side effects.

  • How to Take Viagra:

Doctors usually prescribe taking Viagra 30 minutes to 4 hours before sexual activity (recommended: 1 hour before). Doctors strongly advise not to take Viagra more than once each day. Most importantly, take it only when needed for sexual activity. 

  • Sildenafil Dosage

    • For Erectile Dysfunction (ED): The usual dosage ranges from 25 mg to 100 mg, with 50 mg being the typical starting dose. Like Viagra, doctors may adjust the dose based on effectiveness and side effects. 

Avoid taking it more than once in a day. Doctors prescribe taking this medicine at least 4 hours before having sex. Sexual arousal is necessary for the medication to work effectively.

  • For Pulmonary Hypertension: For treating pulmonary hypertension, Sildenafil tablets have dosages of 10mg and 20mg. Doctors recommend the dosage applicable for adults is 20mg, three times a day. 

This dosage however varies for children. Dosage varies between 10 mg and 20 mg, three times a day, depending on body weight.

Viagra vs Sildenafil: Which is Better? 

Both Viagra and Sildenafil use the same active ingredient in the treatment of erectile dysfunction by enhancing blood flow. The difference lay in the fact that Viagra is a well-known brand name, and Sildenafil is its active molecule.

Affordable Sildenafil works just like Viagra but comes at a lesser cost. Sildenafil is a popular choice, so as not to be burdened by high expenses. Since they work in about 30 to 60 minutes and last for about 4 to 6 hours, they have similar side effects that include headaches, flushing, and dizziness.

Cheap Sildenafil offers the same function as Viagra but gets a lower price tag. Many people choose Sildenafil seeking cheaper alternatives. Both of them are as effective within 30 to 60 minutes of ingestion and last about 4 to 6 hours. They share some side effects, like headaches, flushing, and dizziness.

Are There Additional Options? 

While Viagra and Sildenafil citrate are highly effective for treating erectile dysfunction (ED), other medications might better suit your needs. Here are some additional ED treatment options to consider:

  • Avanafil: Otherwise known as Stendra, this medicine starts working within 15 to 30 minutes. It is designed to specifically target ED while causing fewer side effects lasting for up to 6 hours.

  • Vardenafil: It lasts usually up to 6 hours. As soon as you take this medicine, it starts working within 10 minutes or less. 

  • Dally Tadalafil: It stays active within your body when you take it every day as a low-dose pill. This medicine dosage does not need to be planned around sex, thus, a preferred option for those who prefer flexibility. 

Each of these options has its unique benefits. Consult a healthcare provider to assist you choose the right dosage to meet your needs and preferences. 

Bottom Line

Both Viagra and Sildenafil effectively treat erectile dysfunction (ED) by improving blood flow. Since they contain the same active ingredient, they offer identical dosages, effectiveness, and side effects.

The key difference lies in cost and branding. Sildenafil is a more affordable option, making it the preferred choice for those seeking cost-effective treatment without compromising on effectiveness. Viagra, as a well-known brand, may be preferable for those who trust consistent quality and reputation despite the higher price.

Ultimately, the best choice depends on your budget, personal preference, and doctor’s recommendation. Don't let erectile dysfunction hold you back, reclaim your confidence with Viagra or Sildenafil. Experience lasting performance and satisfaction. Shop now!

Disclaimer: Always consult a healthcare provider before starting any ED medication to ensure safety and suitability for your health needs.

Frequently Asked Questions 

  1. What are the multiple doses of Viagra?

The different doses of Viagra are 25mg, 50mg and 100mg. The usual dosage recommended to begin with is 50mg. A doctor can adjust doses considering how it works. It is advised not to take this pill more than once. 

  1. What are the two common brand name products of Sildenafil?

The two most well-known brand names of Sildenafil are Viagra and Revatio. Viagra is used to treat erectile dysfunction (ED). Revatio is prescribed for pulmonary arterial hypertension (PAH) to improve blood flow in the lungs.

  1. Can I get Viagra online?

Yes, you can purchase Viagra online but from a licensed and trusted pharmacy only. Always ensure the pharmacy is certified and requires a doctor’s prescription to avoid counterfeit or unsafe medications.

  1. Can I get Sildenafil without any prescription?

No, Sildenafil requires a prescription. Buying medications without a prescription increases the risk of receiving unsafe or counterfeit drugs. Always consult a doctor before use to ensure the right dosage and safety.

  1. What else is treated with Sildenafil?

Besides treating erectile dysfunction (ED), Sildenafil is also used to manage pulmonary arterial hypertension (PAH) by improving blood circulation in the lungs. Additionally, it can help improve blood flow to extremities, benefiting conditions related to poor circulation in the fingers and toes.


References

https://www.drugs.com/viagra.html

https://www.drugs.com/Sildenafil.html

https://www.webmd.com/drugs/2/drug-7418/Sildenafil-oral/details

https://www.dcurology.net/2023/06/07/comparing-tadalafil-generic-cialis-and-Sildenafil-generic-viagra/

https://www.mayoclinic.org/diseases-conditions/erectile-dysfunction/in-depth/erectile-dysfunction/art-2004782