Get Sildenafil Prescribed Online

The Company Behind Viagra
What other drugs will affect sildenafil?
Start your treatment journey
Chemical synthesis
Non-medical use
Metrics & Citations
What to avoid

We encourage you to contact our office to learn more. Dr Sandip completed his training in Psychiatry and sexual medicine in the UK. A post-graduate in Psychiatry from KMC Manipal, he worked in the UK for over 8 years following a one-year research post at NIMHANS, Bangalore. With an interest in the fields of sexual health and functioning, he has authored articles in books and peer-reviewed journals. A recipient of the student of the year award by BSART in 2010, he is currently a consultant psychiatrist and sexual and relationship therapist with a belief in a holistic and psychotherapeutic approach to treating psychological distress.

The Company Behind Viagra

Sildenafil wears off in a few hours, which is why it’s usually considered a “planned window” medication rather than an all-day one. Timing: Take it about 1 hour before sex (30–60 minutes is common), with the FDA “window” up to 4 hours. Food: For erectile dysfunction, it’s best to take sildenafil on an empty stomach. A heavy or fatty meal ( like biryani or paranthas) can make it take longer to kick in. Alcohol: Heavy drinking can make erections harder to achieve, even if sildenafil is taken.

How should I store sildenafil?

Grapefruit juice: Guidelines say tablets can be swallowed with water or juice, but not grapefruit juice. Grapefruit can change sildenafil levels by affecting some enzymes in the body that may prevent the medicine from acting properly. Don’t chase it with extra pills: If 50 mg didn’t work once, taking more the same day raises side effects and health risks without guaranteeing success. The safer approach is review + correct use + dose adjustment with a doctor's prescription. It’s normal for sildenafil to work better after a few tries. Dr. Pranitha Bangera is a gold-medalist healthcare professional with an elite foundation in clinical training and patient care. A researcher at heart, she specializes in creating high-impact, research-driven medical content that empowers readers through accessible patient education. Dr. Bangera focuses on the intersection of digital health and clinical communication, specifically within the fields of sexual health and mental well-being. Her work is dedicated to making complex medical innovations understandable and trustworthy for a global audience. Our experts continually monitor the health and wellness space, and we update our articles when new information becomes available. Sildenafil (commonly known as Viagra) is a highly effective, FDA-approved medication that has revolutionized erectile dysfunction treatment by targeting the root cause- poor blood flow to the penis. The medication is typically taken 30-60 minutes before intimacy, with flexible dosing from 20-100mg depending on individual needs, effectiveness lasting 4-6 hours, and common mild side effects like headaches and flushing that often improve with continued use. While generally safe for most men, sildenafil requires careful medical evaluation due to serious contraindications with nitrate medications and certain heart conditions. Sildenafil for erectile dysfunction is one of the most researched and commonly prescribed options for erectile problems. It’s best known by the brand name Viagra, but it’s also widely available as generic sildenafil and other brand names. Sildenafil helps with erectile dysfunction by relaxing the blood vessels in the penis, so more blood can flow in when you’re sexually aroused. It blocks a chemical that normally “switches off” the erection signal too quickly, letting the natural process of erection work for longer. It won’t cause an erection on its own, and it only works with sexual stimulation.

Sildenafil is a medication used to treat erectile dysfunction in men.
It works by increasing blood flow to the penis during arousal.
Sildenafil is commonly sold under the brand name Viagra.
The typical dose ranges from 25 mg to 100 mg, taken before sexual activity.
It usually takes about 30 to 60 minutes to work after ingestion.
Sildenafil's effects can last for up to 4-6 hours.
It can cause side effects like headaches, flushing, and nasal congestion.
Sildenafil should not be used with nitrate medications due to risk of dangerous drops in blood pressure.
It is available by prescription from a healthcare provider.
Do not take sildenafil more than once a day to avoid adverse effects.

In this article, you'll see how does sildenafil work for erectile dysfunction, how to take it correctly, what is sildenafil 20 mg dosage for erectile dysfunction, the most common side effects caused, key drug interaction risks and what to do if it doesn’t work well the first few times. Sildenafil citrate is a prescription medicine that belongs to the drug class called PDE5 inhibitors and is used to treat erectile dysfunction. It’s the active ingredient in Viagra and has been FDA-approved for ED since March 27, 1998. One of the earliest studies showed that men taking sildenafil had significantly better erection outcomes than placebo, which is why it became the first widely prescribed ED drug — now sold under brand names like Viagra. Over time, the evidence only got stronger.

Advice Item	Explanation	Source
Take on an empty stomach	Food, especially fatty meals, can delay absorption	Medical guidelines
Avoid alcohol	Can impair effectiveness and increase side effects	Doctor advice
Do not exceed prescribed dose	Increased risk of side effects	Pharmaceutical recommendation
Report unexpected side effects	Such as vision changes, prolonged erections	Healthcare provider

A well-known study found that sildenafil improved the ability to get erections firm enough for penetration and complete intercourse. More recent research still shows that sildenafil works well for many men with ED, and most side effects are mild and manageable when used correctly — though many men also consider longer-acting options like Cialis for ED. During sexual stimulation, nerves and blood vessel lining in the penis release a chemical called nitric oxide (NO). NO activates an enzyme called guanylate cyclase, which increases another chemical called cGMP. cGMP is a messenger chemical that tells the muscles in the penis to relax. This relaxation lets blood vessels open wider so more blood can enter and stay there. The body also contains an enzyme called phosphodiesterase type 5 (PDE5). Its job is to block the enzyme PDE5, allowing cGMP to last longer, which, as mentioned earlier, keeps the penile muscles relaxed and increases blood flow to the penis. This helps the erection stay firm for longer. For most patients, the FDA label for Viagra recommends[4]: Starting dose: 50 mg, taken in the form of oral tablets, as needed about 1 hour before sexual activity Adjustments: may be lowered to 25 mg or increased to 100 mg based on effectiveness and tolerability Maximum frequency: once per day (don’t “double-dose” to force a result) Keep in mind, sildenafil won’t give you an erection on its own. It only works when you're sexually aroused, so intimacy and stimulation during sexual activity are still needed. Some sildenafil chewable tablets people also ask about "sildenafil 20 mg dosage for erectile dysfunction". While 20 mg isn’t the standard ED tablet strength in most guidelines, a clinician may sometimes use a lower or customized dose in select cases: Sensitive to side effects: If 25mg causes bothersome headaches or flushing, 20mg may provide benefits with fewer issues Mild ED: When erections are almost there but need slight improvement Precise dosing: Bridging the gap between standard dose increments Cautious start: Some doctors prefer "start low, go slow" approaches A simple way to understand the doses: 25 mg: often used when someone is older, sensitive to side effects, has certain health issues, or takes interacting medicines 100 mg: sometimes used if lower doses aren’t effective and side effects are manageable [4] Your healthcare provider can help determine if this customized dose is right for you. Most people feel that sildenafil starts working in about 30 to 60 minutes, and it can be taken anywhere from 30 minutes to 4 hours before sex.

Sildenafil is a phosphodiesterase type 5 (PDE5) inhibitor.
The drug was first approved by the FDA in 1998.
It can be purchased online but requires a prescription in most countries.
Generic versions of sildenafil are typically cheaper than brand-name Viagra.
Proper storage involves keeping it at room temperature away from moisture.
Sildenafil does not protect against sexually transmitted diseases.
Lifestyle changes like exercise and healthy eating can enhance results.
Combining sildenafil with other ED treatments should be discussed with a doctor.
It's important to inform your doctor about all medications you take.
Sildenafil is not an aphrodisiac and requires sexual stimulation to work.

[5] The effect is often described as lasting about 4 hours for many men (sometimes a bit longer or shorter).

Product	Dosage	Quantity + Bonus	Price
Viagra Generic	150mg	180 + 10 Pills	236.46€ 225.20€
Kamagra Soft Tabs	100mg	12 Pills	57.55€ 54.81€
Kamagra	100mg	20 Pills	86.09€ 81.99€
Viagra Generic	50mg	90 + 6 Pills	107.37€ 102.26€
Kamagra Soft Tabs	100mg	180 + 8 Pills	425.45€ 405.19€
Viagra Generic	100mg	270 + 10 Pills	270.47€ 257.59€
Kamagra	100mg	84 + 6 Pills	264.44€ 251.85€
Kamagra Soft Tabs	100mg	20 Pills	79.79€ 75.99€
Viagra Generic	150mg	120 + 8 Pills	177.58€ 169.12€
Kamagra	100mg	360 + 6 Pills	839.95€ 799.95€

Sildenafil wears off in a few hours, which is why it’s usually considered a “planned window” medication rather than an all-day one.

Sildenafil helps improve erections by relaxing penile muscles.
The drug's popularity increased rapidly after approval in the late 1990s.
It is part of a class of medications called PDE5 inhibitors.
Sildenafil's development marked a breakthrough for men's health.
There are ongoing studies to expand sildenafil's therapeutic uses.
Regular medical check-ups are advised for long-term sildenafil use.
Generic sildenafil has made treatment more affordable worldwide.
It’s crucial to adhere to prescribed doses to avoid adverse effects.
The medication is often taken about 30 minutes before sexual activity.
Using sildenafil responsibly can improve quality of life for many men.

Timing: Take it about 1 hour before sex (30–60 minutes is common), with the FDA “window” up to 4 hours. Food: For erectile dysfunction, it’s best to take sildenafil on an empty stomach.

What other drugs will affect sildenafil?

Serious Side Effects

Dr. Pranitha Bangera is a gold-medalist healthcare professional with an elite foundation in clinical training and patient care. A researcher at heart, she specializes in creating high-impact, research-driven medical content that empowers readers through accessible patient education. Dr. Bangera focuses on the intersection of digital health and clinical communication, specifically within the fields of sexual health and mental well-being. A heavy or fatty meal ( like biryani or paranthas) can make it take longer to kick in. Alcohol: Heavy drinking can make erections harder to achieve, even if sildenafil is taken. Grapefruit juice: Guidelines say tablets can be swallowed with water or juice, but not grapefruit juice. Grapefruit can change sildenafil levels by affecting some enzymes in the body that may prevent the medicine from acting properly. Don’t chase it with extra pills: If 50 mg didn’t work once, taking more the same day raises side effects and health risks without guaranteeing success. The safer approach is review + correct use + dose adjustment with a doctor's prescription. It’s normal for sildenafil to work better after a few tries. Many men need a couple of attempts to learn the best timing, meal pattern, and stimulation context. Most side effects are mild and temporary: Other common ones include n****asal congestion (a stuffy nose) and mild visual disturbance (like changes in color perception or light sensitivity). Seek medical attention urgently if any of these happen: Erection lasting more than 4 hours (priapism) Sudden vision changes, vision loss, or sudden hearing loss Chest pain, fainting, or symptoms that could suggest a heart attack Sildenafil may not be suitable (or needs careful medical review) for people who: Have serious heart problems or a recent stroke/heart attack Have certain inherited eye diseases (like retinitis pigmentosa) If there’s any doubt, it should be treated as a “check first” situation, not a “try and see” situation — the same caution applies to Levitra (Vardenafil) for ED.

Start your treatment journey

Medications like sildenafil are safe, effective, and nothing to be ashamed of. In India, sildenafil citrate prices vary a lot by brand name, discount, and pharmacy. For a common strength like sildenafil 50 mg, a strip of 4 tablets on major e-pharmacies is often roughly in the ₹90 to ₹170 range for many generics. Use this pricing band as a “red flag check”: Massively overpriced listings (far above typical MRPs without a clear reason) can be a rip-off. Suspiciously cheap offers from unverified sellers can be risky too (counterfeit or improperly stored meds).

Pregnancy and breastfeeding while taking sildenafil

Also worth noting: branded Viagra is typically much more expensive per tablet than generics. This is because sildenafil can lower blood pressure, and combining higher doses with blood pressure medicines can increase dizziness or lightheadedness.

Chemical synthesis

Many men need a couple of attempts to learn the best timing, meal pattern, and stimulation context. Most side effects are mild and temporary: Other common ones include n****asal congestion (a stuffy nose) and mild visual disturbance (like changes in color perception or light sensitivity). Seek medical attention urgently if any of these happen: Erection lasting more than 4 hours (priapism) Sudden vision changes, vision loss, or sudden hearing loss Chest pain, fainting, or symptoms that could suggest a heart attack Sildenafil may not be suitable (or needs careful medical review) for people who: Have serious heart problems or a recent stroke/heart attack Have certain inherited eye diseases (like retinitis pigmentosa) If there’s any doubt, it should be treated as a “check first” situation, not a “try and see” situation — the same caution applies to Levitra (Vardenafil) for ED. This is because sildenafil can lower blood pressure, and combining higher doses with blood pressure medicines can increase dizziness or lightheadedness. Some recreational drugs (especially nitrate-based “poppers”) can dangerously drop blood pressure when taken with sildenafil.

Related treatment guides

Even when people feel otherwise healthy, the health risks here are real. In India, sildenafil citrate is a Schedule H prescription medicine, which means it should not be sold over the counter without a valid prescription from a Registered Medical Practitioner. Be cautious with online sellers and “too cheap to be true” offers. Counterfeit ED pills are a real problem, and scammy sellers (and yes, even pesky bots pushing “miracle” deals) can create serious health risks. When sildenafil disappoints, it’s often not because the medication “failed.” Common reasons include: Wrong timing: taken too close to sex or after a heavy meal Too much alcohol: worsens erection quality and can worsen dizziness via lower blood pressure Not enough sexual stimulation: sildenafil supports arousal, but it can not replace it Uncontrolled medical drivers: diabetes, high blood pressure, vascular disease affecting penile blood vessels and blood flow Performance anxiety and stress are very common causes and require psychological interventions Hormone issues (like low testosterone) can reduce sexual response even with good blood flow ED is a lot more common than you think, and talking about it is the first step to fixing it. Some recreational drugs (especially nitrate-based “poppers”) can dangerously drop blood pressure when taken with sildenafil. Even when people feel otherwise healthy, the health risks here are real. In India, sildenafil citrate is a Schedule H prescription medicine, which means it should not be sold over the counter without a valid prescription from a Registered Medical Practitioner.

Non-medical use

Organic Nitrates, Nitrites, and Nitric Oxide Donors

Metrics & Citations

This relaxation lets blood vessels open wider so more blood can enter and stay there. The body also contains an enzyme called phosphodiesterase type 5 (PDE5). Its job is to block the enzyme PDE5, allowing cGMP to last longer, which, as mentioned earlier, keeps the penile muscles relaxed and increases blood flow to the penis. This helps the erection stay firm for longer. For most patients, the FDA label for Viagra recommends[4]: Starting dose: 50 mg, taken in the form of oral tablets, as needed about 1 hour before sexual activity Adjustments: may be lowered to 25 mg or increased to 100 mg based on effectiveness and tolerability Maximum frequency: once per day (don’t “double-dose” to force a result) Keep in mind, sildenafil won’t give you an erection on its own.

Vitamin K Antagonists

It only works when you're sexually aroused, so intimacy and stimulation during sexual activity are still needed. Some sildenafil chewable tablets people also ask about "sildenafil 20 mg dosage for erectile dysfunction". While 20 mg isn’t the standard ED tablet strength in most guidelines, a clinician may sometimes use a lower or customized dose in select cases: Sensitive to side effects: If 25mg causes bothersome headaches or flushing, 20mg may provide benefits with fewer issues Mild ED: When erections are almost there but need slight improvement Precise dosing: Bridging the gap between standard dose increments Cautious start: Some doctors prefer "start low, go slow" approaches A simple way to understand the doses: 25 mg: often used when someone is older, sensitive to side effects, has certain health issues, or takes interacting medicines 100 mg: sometimes used if lower doses aren’t effective and side effects are manageable [4] Your healthcare provider can help determine if this customized dose is right for you. Most people feel that sildenafil starts working in about 30 to 60 minutes, and it can be taken anywhere from 30 minutes to 4 hours before sex. [5] The effect is often described as lasting about 4 hours for many men (sometimes a bit longer or shorter). When sildenafil disappoints, it’s often not because the medication “failed.” Common reasons include: Wrong timing: taken too close to sex or after a heavy meal Too much alcohol: worsens erection quality and can worsen dizziness via lower blood pressure Not enough sexual stimulation: sildenafil supports arousal, but it can not replace it Uncontrolled medical drivers: diabetes, high blood pressure, vascular disease affecting penile blood vessels and blood flow Performance anxiety and stress are very common causes and require psychological interventions Hormone issues (like low testosterone) can reduce sexual response even with good blood flow ED is a lot more common than you think, and talking about it is the first step to fixing it. Medications like sildenafil are safe, effective, and nothing to be ashamed of. In India, sildenafil citrate prices vary a lot by brand name, discount, and pharmacy.

Sildenafil can sometimes cause flushing and nasal congestion.
It is not a cure for erectile dysfunction, only a treatment option.
Psychological factors can also affect erectile performance alongside medication.
Sildenafil may sometimes interact with foods that contain high fat content.
Regular exercise and stress management can complement treatment with sildenafil.
The medication should be stored safely out of children's reach.
Reporting side effects to a healthcare provider is important for safety.
Sildenafil is typically started at a low dose, gradually increased if needed.
It is important to follow the prescribed timing for medication intake.
Discontinuing sildenafil should be discussed with a healthcare professional.

For a common strength like sildenafil 50 mg, a strip of 4 tablets on major e-pharmacies is often roughly in the ₹90 to ₹170 range for many generics.

What to avoid

Her work is dedicated to making complex medical innovations understandable and trustworthy for a global audience. Our experts continually monitor the health and wellness space, and we update our articles when new information becomes available. Sildenafil (commonly known as Viagra) is a highly effective, FDA-approved medication that has revolutionized erectile dysfunction treatment by targeting the root cause- poor blood flow to the penis. The medication is typically taken 30-60 minutes before intimacy, with flexible dosing from 20-100mg depending on individual needs, effectiveness lasting 4-6 hours, and common mild side effects like headaches and flushing that often improve with continued use. While generally safe for most men, sildenafil requires careful medical evaluation due to serious contraindications with nitrate medications and certain heart conditions.

Drug Synonyms

Sildenafil for erectile dysfunction is one of the most researched and commonly prescribed options for erectile problems. It’s best known by the brand name Viagra, but it’s also widely available as generic sildenafil and other brand names. Sildenafil helps with erectile dysfunction by relaxing the blood vessels in the penis, so more blood can flow in when you’re sexually aroused. It blocks a chemical that normally “switches off” the erection signal too quickly, letting the natural process of erection work for longer. It won’t cause an erection on its own, and it only works with sexual stimulation. Use this pricing band as a “red flag check”: Massively overpriced listings (far above typical MRPs without a clear reason) can be a rip-off. Suspiciously cheap offers from unverified sellers can be risky too (counterfeit or improperly stored meds).

Study/Survey	Percentage of Effectiveness	Sample Size	Notes
Clinical Trial A	70-80%	500	Erectile improvement observed
User Survey B	75%	1,200	Satisfaction rate
Meta-Analysis C	78%	Various	Consistent efficacy

Also worth noting: branded Viagra is typically much more expensive per tablet than generics.