How to Reduce Avanafil Side Effects

How to Reduce Avanafil Side Effects: A Pharmacist's Guide

Published: 6 November 2026

If you're wondering how to reduce avanafil side effects, you're not alone—many men experience mild, temporary effects like headache or flushing when starting this erectile dysfunction treatment. Avanafil (brand name Spedra) is a fast-acting PDE5 inhibitor that works in as little as 15–30 minutes, but understanding how to manage its side effects can help you use it more comfortably and confidently [6]. This guide explains why side effects happen, how long they typically last, and evidence-based steps you can take to minimise them.

Why Does Avanafil Cause Side Effects?

Avanafil works by blocking an enzyme called phosphodiesterase type 5 (PDE5), which increases blood flow to the penis during sexual stimulation [6]. However, PDE5 is also present in other parts of the body—including blood vessels in the head, face, and digestive system—so blocking it can lead to temporary effects such as headache, facial flushing, nasal congestion, or indigestion [6].

These side effects are usually mild and reflect the medicine doing its job: widening blood vessels. Most men find that side effects lessen over time as the body adjusts to the medication [11]. The good news is that avanafil is selective for PDE5 and has a relatively short half-life, meaning it leaves the body fairly quickly, which may reduce the duration of unwanted effects compared to longer-acting alternatives [6][11].

Understanding the mechanism helps explain why simple adjustments—such as timing, hydration, and dose—can make a real difference to your experience.

How Common Are Avanafil Side Effects?

Clinical trials show that the most frequently reported side effects of avanafil are headache (affecting up to 1 in 10 men), flushing, and nasal congestion [6][11]. These are classified as 'common' in medical terms, meaning they occur in between 1 in 10 and 1 in 100 people. Indigestion, back pain, and dizziness are less common but still reported [6].

Importantly, most side effects are mild to moderate and short-lived. Serious side effects—such as sudden vision or hearing loss, or an erection lasting more than four hours (priapism)—are rare but require immediate medical attention [6]. The majority of men tolerate avanafil well, and many find that any initial discomfort reduces significantly after the first few doses as their body adapts [11].

If you experience persistent or bothersome side effects, it's worth discussing dose adjustment or alternative treatments with your prescriber rather than stopping treatment altogether.

Comparing Side-Effect Profiles Across ED Medicines

All PDE5 inhibitors share a similar side-effect profile because they work in the same way, but individual responses vary [2]. Some men find avanafil causes fewer side effects than sildenafil or tadalafil, possibly because of its selectivity and shorter duration of action [11]. Others may tolerate a different PDE5 inhibitor better. There is no single 'best' option—what matters is finding the medicine and dose that works for you with the fewest unwanted effects.

How Long Do Avanafil Side Effects Last?

Because avanafil is designed to act quickly and leave the body relatively fast, side effects typically last only a few hours [6]. Headache and flushing usually peak within the first two to three hours after taking the tablet and then fade as the medicine is metabolised [6]. Nasal congestion may persist a little longer but is generally mild.

The half-life of avanafil is around three to five hours, meaning the concentration in your bloodstream halves during that time [6]. Most men find that any side effects have resolved completely within six to eight hours. If you take avanafil in the evening, you're unlikely to notice lingering effects the next morning.

For men who experience side effects with every dose, it's worth considering whether the timing of the tablet, food intake, or alcohol consumption might be contributing factors. Adjusting these variables can often reduce both the intensity and duration of unwanted effects.

Practical Tips on How to Reduce Avanafil Side Effects

Start with the lowest effective dose (usually 50 mg or 100 mg) and only increase if needed, as higher doses are more likely to cause side effects [6]. Take avanafil on an empty stomach or after a light meal; heavy, fatty foods can delay absorption and may worsen indigestion [6]. Stay well hydrated before and after taking the tablet, as dehydration can make headaches and dizziness worse.

Limit alcohol intake—heavy drinking not only worsens erectile dysfunction but also increases the risk of dizziness and low blood pressure when combined with avanafil [6]. Avoid grapefruit juice, which can raise avanafil levels in the blood and increase side effects [6]. If you experience a headache, a standard dose of paracetamol or ibuprofen (if suitable for you) can help; these painkillers do not interact with avanafil.

For flushing or nasal congestion, staying cool and using a saline nasal spray may provide relief. If indigestion is troublesome, an over-the-counter antacid (such as Gaviscon) is usually safe to use alongside avanafil, but check with your pharmacist if you're unsure. Many men find that side effects lessen after the first two or three doses as the body adjusts, so it's worth persevering if the medicine is otherwise effective.

When to Consider a Lower Dose or Alternative

If side effects remain bothersome despite these measures, speak to your prescriber about reducing the dose or switching to a different PDE5 inhibitor [2]. Tadalafil, for example, can be taken daily at a low dose (2.5 mg or 5 mg), which may result in fewer peaks and troughs and a different side-effect experience [4]. Sildenafil and vardenafil are also options, and some men tolerate one better than another [3][5]. Your prescriber can help you find the right balance between effectiveness and comfort.

When to Seek Urgent Medical Help

Most avanafil side effects are mild and self-limiting, but certain symptoms require immediate attention. If you develop sudden loss of vision in one or both eyes, stop taking avanafil and seek urgent medical help, as this may indicate a rare condition called non-arteritic anterior ischaemic optic neuropathy (NAION) [6]. Similarly, sudden hearing loss or ringing in the ears warrants immediate assessment.

An erection lasting more than four hours (priapism) is a medical emergency and can cause permanent damage if not treated promptly—go to A&E straight away [6]. If you experience chest pain during or after sexual activity, do not take another dose and contact your GP or call 999, as this may indicate an underlying heart problem [6].

Severe allergic reactions (rash, swelling of the face or throat, difficulty breathing) are very rare but require emergency treatment. If you feel unwell in a way that concerns you, trust your instinct and seek medical advice. Never take avanafil with nitrates (such as GTN spray), nicorandil, riociguat, or recreational drugs called 'poppers', as the combination can cause a dangerous drop in blood pressure [6].

Alternatives If Avanafil Side Effects Persist

If you've tried dose adjustment and self-care measures but still find avanafil side effects unacceptable, several alternatives are available. Switching to a different PDE5 inhibitor—such as sildenafil, tadalafil, or vardenafil—may suit you better, as individual tolerance varies [2][3][4][5]. Tadalafil is particularly popular for its long duration (up to 36 hours) and the option of a low daily dose, which some men find causes fewer side effects than on-demand tablets [4].

For men who cannot tolerate any oral PDE5 inhibitor, other treatments include Eroxon gel (a topical medical device available without prescription), Vitaros cream (a prescription alprostadil product applied to the urethra), or Caverject injections (alprostadil injected into the penis) [7]. Vacuum erection devices and penile implants are non-drug options that may be considered in specific circumstances [2].

It's also important to address underlying causes of erectile dysfunction, such as diabetes, high blood pressure, obesity, smoking, or psychological factors [1][2]. Lifestyle changes—regular exercise, a healthy diet, reducing alcohol, and stopping smoking—can improve erectile function and may reduce your need for medication or allow you to use a lower dose [1][2]. Your GP or a specialist can provide a comprehensive assessment and tailor treatment to your individual needs.

How Cured Pharmacy Can Help

Cured Pharmacy is a GPhC-registered online pharmacy (GPhC 9012511) offering a confidential, UK prescriber-led consultation for erectile dysfunction treatments. Whether you're starting avanafil (Spedra) or considering an alternative such as sildenafil or tadalafil, our service allows you to discuss your symptoms, current medications, and any side effects with a qualified prescriber who can recommend the most suitable option. Prescriptions are dispensed and delivered discreetly to your door, and our pharmacy team is available to answer questions about how to reduce avanafil side effects or manage your treatment safely.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 6 November 2026]
2. National Institute for Health and Care Excellence. (n.d.). Erectile dysfunction. Clinical Knowledge Summaries. https://cks.nice.org.uk/topics/erectile-dysfunction/ [accessed 6 November 2026]
3. Joint Formulary Committee. (n.d.). Sildenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/sildenafil/ [accessed 6 November 2026]
4. Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 6 November 2026]
5. Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 6 November 2026]
6. Joint Formulary Committee. (n.d.). Avanafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/avanafil/ [accessed 6 November 2026]
7. Joint Formulary Committee. (n.d.). Alprostadil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/alprostadil/ [accessed 6 November 2026]
8. National Institute for Health and Care Excellence. (2014). Erectile dysfunction: avanafil (ESNM45). https://www.nice.org.uk/advice/esnm45 [accessed 6 November 2026]

Information on this page is for educational purposes only and is not medical advice. Prescription treatments require clinical assessment by a UK-registered prescriber. Always consult a qualified healthcare professional before starting or changing any medication.