Stendra (Avanafil) – Patient-Friendly Guide (United Kingdom)

Stendra is a medicine containing avanafil, used to treat erectile dysfunction (ED) in adult men. It helps you get and keep an erection when you are sexually stimulated. This page explains how Stendra works, how quickly it can act, how to take it safely, and what to consider regarding food, alcohol, and other medicines.

Always follow the instructions provided with your medicine and talk to a healthcare professional if you have questions—especially if you have heart disease, take multiple medicines, or have had side effects with ED treatments before.

Quick facts

• Active ingredient: Avanafil
• Brand: Stendra
• What it treats: Erectile dysfunction (ED)
• How it works: Improves blood flow to the penis during sexual stimulation
• How fast it may work: Often within about 15–30 minutes (varies by person and dose)
• Typical dosing: Taken as needed before sexual activity
• Important safety note: Do not use with nitrate medicines

Basic product information

Stendra contains avanafil, a prescription-only medicine in the UK. It comes in film-coated tablets in different strengths (commonly 50 mg, 100 mg, and 200 mg). Your exact dose and suitability depend on your health and the medicines you take.

Mechanism of action (how Stendra works)

Erection depends on blood flow. During sexual stimulation, nerves and hormones trigger signals that relax blood vessels in the penis. This allows increased blood flow and helps produce an erection.

Avanafil belongs to a group called PDE5 inhibitors. It works by blocking an enzyme called phosphodiesterase type 5 (PDE5). By inhibiting PDE5, Stendra helps maintain cGMP levels in penile tissue. Higher cGMP supports smooth muscle relaxation, improving blood flow when you become sexually aroused.

Key point: Stendra does not automatically cause an erection. It works best when there is sexual stimulation.

Pharmacokinetics (how the body handles it)

After taking a tablet, avanafil is absorbed from the gut and reaches peak levels in the blood after a period that can vary by person. It is then metabolised primarily by liver enzymes (including CYP3A4) and removed mostly through the body’s normal elimination pathways.

In practical terms, what matters for many users is:

• Time to effect: Often begins within about 15 minutes for some men, and commonly within 30 minutes.
• Duration: Effects may last long enough for planned sexual activity, though the exact duration varies by dose and individual factors.
• Metabolism and interactions: Medicines that strongly affect CYP3A4 can increase or decrease avanafil levels.

Typical use: when and how to take Stendra

Stendra is taken as needed before sexual activity. It is used to treat erectile dysfunction and is intended for adult men. Your healthcare professional may adjust dose and timing based on your response and other health factors.

Timing: planning for best results

• Many men take Stendra about 15–30 minutes before sex.
• If you do not get the desired effect at first, your dose may be adjusted or you may be advised to change how you take it.
• Allow time for the medicine to work—especially if you are trying it for the first time.

How to take it

Take the tablet by mouth with water. Swallow it whole—do not crush or chew unless advised otherwise by your clinician or the product instructions.

Don’t exceed the recommended frequency. Many PDE5 inhibitors are limited to about once per day. Use only as directed for your dose.

Indications (what Stendra is indicated for)

Stendra is indicated for the treatment of erectile dysfunction in adult men. ED means persistent difficulty obtaining or maintaining an erection suitable for satisfactory sexual activity.

ED can have many causes, including vascular, neurological, hormonal, medication-related, or psychological factors. If ED is new or worsening, it is important to consider a broader medical assessment.

Dosing (general guidance)

Doses depend on your health status, response, and potential drug interactions. Common strengths are 50 mg, 100 mg, and 200 mg.

The following information is general and should not replace the dosing instructions provided with your medicine. Always use the dose recommended for you.

Common practical approach

• Start at a lower dose if needed: Some men may begin with 100 mg or 50 mg, depending on suitability.
• Adjust based on response: If the effect is not adequate, dose may be increased.
• Consider lower doses with interacting medicines: Strong CYP3A4 inhibitors may require dose reduction and extra caution.

Missed dose

Stendra is used as needed. If you do not take it before sex, you should not take it later “just because.” Follow the timing guidance for your next planned occasion and avoid exceeding daily limits.

Food interactions (and how to manage them)

Food can affect absorption. In general, heavy or high-fat meals may delay the onset or reduce the effectiveness of some oral ED medicines.

Tips to improve reliability:

• If you’re planning to use Stendra, consider taking it when your stomach is not heavily loaded with food.
• If you often eat large or fatty meals, you may notice the medicine takes longer to work—plan accordingly.
• If you try Stendra on an empty stomach and later on a full stomach, results may differ; consistency can help you find the best routine.

Alcohol and medicine interactions

Alcohol

Alcohol can worsen ED and may increase dizziness or light-headedness—especially when combined with medicines that affect blood vessels. Moderate alcohol is sometimes tolerated, but avoid heavy drinking to reduce the risk of side effects and improve performance.

Important medicine interactions

Some medicines can interact with avanafil by changing blood levels or affecting blood pressure. It is essential to tell your healthcare professional (or pharmacist) about all medicines you take, including:

• Prescription medicines
• Over-the-counter products
• Herbal supplements (including “natural” products)
• Recreational substances

Nitrates: absolute contraindication

Do not use Stendra with nitrate medicines (including short-acting or long-acting nitrates) used for chest pain (angina), because the combination can cause a dangerous drop in blood pressure.

Riociguat

Stendra should not be used with riociguat (used for certain lung/blood vessel conditions), due to the risk of blood pressure effects.

Alpha-blockers (for prostate/urinary symptoms and blood pressure)

If you take an alpha-blocker, there can be additive blood-pressure effects. Your clinician may need to start with lower doses and adjust timing to reduce the risk of dizziness or fainting.

CYP3A4 inhibitors and inducers

Avanafil is metabolised by CYP3A4. Medicines that strongly inhibit this pathway may increase avanafil exposure, raising the chance of side effects. Medicines that induce CYP3A4 may reduce effectiveness.

Examples (not exhaustive):

• Stronger CYP3A4 inhibitors (may increase avanafil levels): some antifungals and certain antibiotics, as well as some HIV medicines.
• CYP3A4 inducers (may reduce avanafil levels): some seizure medicines and certain herbal products.

Other ED treatments

Do not combine Stendra with other PDE5 inhibitors (such as sildenafil, tadalafil, or vardenafil). Combining can increase the risk of adverse effects.

Safety profile (who should be cautious)

Like all medicines, Stendra can cause side effects. Many are mild and temporary, but some may require urgent medical attention. Discuss your medical history with a healthcare professional, especially if you have cardiovascular disease.

Common side effects

Commonly reported effects for avanafil and PDE5 inhibitors include:

• Headache
• Flushing (warmth/redness)
• Stuffy or runny nose
• Dizziness
• Indigestion or mild gastrointestinal discomfort
• Back pain (less common for some people; may occur)

Seek urgent help if you experience serious symptoms

Contact urgent care/emergency services immediately if you have:

• Chest pain or symptoms suggesting a heart problem
• Severe dizziness, fainting, or collapse
• Sudden vision loss or severe eye pain
• Sudden hearing loss or ringing in the ears
• Priapism (an erection lasting more than a few hours, typically >4 hours) – this is an emergency

Special caution

Be extra careful and get professional advice if you have any of the following:

• Known heart conditions, unstable angina, or recent cardiovascular events
• Low blood pressure or a history of fainting
• Severe liver disease or severe kidney impairment (dose adjustment may be needed)
• History of stroke
• Conditions affecting the penis (for example, Peyronie’s disease)
• Retinitis pigmentosa (rare inherited eye disorder)
• Use of medicines that interact with avanafil (as outlined above)

Practical use tips for best outcomes

• Take it at the right time: Start with the recommended timing and adjust only if your clinician advises.
• Be mindful of food: If meals delay your effect, reduce how heavy/fatty the meal is.
• Allow enough time: The first attempt may not reflect long-term response; ED can be influenced by stress, performance anxiety, and overall health.
• Don’t “stack” doses: Avoid taking extra tablets to boost effects; follow the daily limit.
• Use sexual stimulation: PDE5 inhibitors work best when arousal occurs naturally.
• Review your wider ED plan: Sleep, stress management, smoking cessation, and exercise can support erectile health.
• Check medication lists: Some medicines (not ED medicines) can cause ED; your clinician may offer alternatives.

Alternative options

If Stendra doesn’t provide the results you want—or if it’s not suitable—there are other options for managing erectile dysfunction. Your best choice depends on your health, preferences, and interactions with other medicines.

Other PDE5 inhibitors

• Sildenafil (often taken a bit earlier; food may affect onset)
• Tadalafil (longer duration; different dosing options may exist)
• Vardenafil (similar class; individual response varies)

Non-tablet options

• Vacuum erection devices
• Intra-cavernosal injections or intra-urethral treatments (specialist-led)
• Psychosexual support if anxiety or relationship factors contribute

If ED is persistent, it can be a sign of underlying health issues (such as cardiovascular disease or diabetes). Addressing the root cause can improve outcomes over time.

United Kingdom market and legal context

In the UK, Stendra (avanafil) is an approved medicine and is typically available through appropriate medical pathways. Online pharmacies in the UK must comply with applicable regulations on medicines, safety, and patient information.

When using an online pharmacy, choose providers that:

• Provide clear product information and UK-relevant safety guidance
• Use secure ordering and appropriate identity/clinical checks
• Explain how medicines are supplied and what to do in case of side effects
• Are transparent about delivery times and returns/disposal

Recent guidance note: ED medicines continue to be managed through safety-focused prescribing and patient assessment. UK healthcare recommendations generally emphasise careful screening for cardiovascular risk, avoidance of unsafe combinations (especially nitrates), and consideration of interacting medications.

Delivery and availability (what to expect)

Availability can vary by supplier and tablet strength. Delivery times depend on stock status, location, and shipping method. When ordering online, you should receive clear information about:

• Estimated delivery window
• Packaging (discreet delivery options are commonly available)
• Tracking details (if offered)
• How to contact support if your order is delayed or incorrect

For best care of your medicine, store tablets according to the product packaging (typically in a dry place at controlled room temperature). Keep out of the sight and reach of children.

FAQ

How quickly does Stendra work?

Many men notice effects within 15–30 minutes. Onset can be slower if you’ve eaten a heavy meal or if there are other individual factors. First-time results may vary, so consider your timing and food intake.

How long does it last?

The effect duration varies by dose, metabolism, and individual response. Plan sexual activity within a time window where the medicine is likely to be active, and avoid increasing frequency beyond the recommended limit.

Can I take Stendra every day?

Stendra is generally used as needed and should not be taken more often than the recommended daily limit. Your healthcare professional may adjust your regimen based on your circumstances.

Will Stendra cure erectile dysfunction?

Stendra helps manage symptoms (erections) during sexual stimulation, but it does not cure all underlying causes of ED. Lifestyle changes and addressing contributing medical conditions can make treatment more effective over the long term.

What if it doesn’t work the first time?

ED treatments can take some “trial” to find the right dose and timing. Consider how you took it (including food and alcohol), and speak to a healthcare professional about adjusting the dose or exploring alternative options.

Can I take it with food?

You can generally take Stendra with or without food, but heavy or high-fat meals may slow onset or reduce effect. For more consistent results, avoid large fatty meals close to dosing.

Is it safe to drink alcohol with Stendra?

Moderate alcohol may be tolerated by some people, but heavy drinking can worsen ED and increase side effects like dizziness. Keep alcohol intake limited and see how you respond.

What is the most important interaction to know?

The most critical safety issue is that Stendra must not be used with nitrate medicines (for angina) or riociguat. These combinations can cause dangerous blood pressure changes.

Can I combine Stendra with other ED pills?

Avoid combining PDE5 inhibitors. Using multiple ED medicines together increases the risk of side effects and is generally not recommended. Ask a healthcare professional for guidance.

What should I do if I get side effects?

If side effects are mild, you may be able to continue safely depending on severity. If you experience severe reactions, fainting, chest pain, or signs of vision or hearing problems, seek urgent medical help. If in doubt, contact a healthcare professional or pharmacist.

Where can I get Stendra in the UK?

Stendra is supplied through appropriate UK medicine pathways. Reliable online pharmacies provide clear information about supply, safety checks, and delivery. Choose a reputable provider and ensure you understand how to store the medicine and what to do if you experience side effects.

Summary

Stendra (avanafil) is a PDE5 inhibitor used to treat erectile dysfunction. It can help you achieve an erection when you are sexually stimulated, with onset often in as little as 15–30 minutes. For best results, consider timing, avoid heavy meals close to dosing, and be cautious with alcohol and interacting medicines.

If you have significant health conditions, take multiple medicines, or have had heart-related issues, seek professional advice to ensure safety. Also remember: Stendra is one part of a broader approach to sexual health—addressing lifestyle and underlying causes can make a meaningful difference.