Avanafil and Driving: Is It Safe?

Avanafil and Driving: What You Need to Know

Published: 5 November 2026

Avanafil and driving are generally compatible for most men, as avanafil (Spedra) does not typically impair your ability to drive or operate machinery. However, some men may experience side effects such as dizziness, visual disturbances, or headache that could affect concentration and reaction times [6]. It's important to know how avanafil affects you personally before driving, especially after your first dose.

Does Avanafil Affect Your Ability to Drive?

Avanafil itself does not directly impair driving ability in most men. The medicine works by increasing blood flow to the penis when you are sexually aroused, and it does not cause sedation or drowsiness in the way some other medicines do [6]. Clinical trials have not shown avanafil to have a major impact on cognitive function or motor skills at recommended doses.

That said, individual responses vary. Some men report side effects that could potentially affect driving, including dizziness, headache, flushing, or visual changes such as blurred vision or increased sensitivity to light [6]. These side effects are usually mild and temporary, but if you experience them, you should not drive until they have resolved.

The UK Patient Information Leaflet for avanafil advises caution: if you feel dizzy or experience visual disturbances after taking the medicine, do not drive or use tools or machines until you feel well again [12]. It is sensible to take your first dose at a time when you do not need to drive, so you can assess how your body responds.

If you are taking avanafil for the first time, consider doing so on an evening or weekend when you have no plans to drive. This allows you to monitor any side effects in a safe environment. Most men tolerate avanafil well and can continue their normal activities, including driving, without issue.

Common Side Effects of Avanafil That May Impact Driving

Understanding the potential side effects of avanafil can help you make informed decisions about when it is safe to drive. The most commonly reported side effects include headache, flushing (redness and warmth in the face or chest), nasal congestion, and back pain [6]. These are usually mild and do not typically interfere with driving ability.

However, some side effects are more relevant to driving safety. Dizziness occurs in a small proportion of men and can affect balance and concentration [6]. Visual disturbances—such as blurred vision, changes in colour perception, or increased sensitivity to light—are rare but have been reported with PDE5 inhibitors, including avanafil [6]. If you notice any changes to your vision or feel lightheaded, do not drive.

Avanafil can also cause a small drop in blood pressure, particularly if you are taking other medicines that lower blood pressure or if you drink alcohol [6]. This can lead to feelings of dizziness or faintness, especially when standing up quickly. If you experience these symptoms, avoid driving until they pass and you feel steady again.

It is also worth noting that avanafil is taken 15–30 minutes before sexual activity, so the timing of any side effects is often predictable [6]. If you plan to drive shortly after taking the medicine, be extra cautious and monitor how you feel. Most side effects, if they occur, are short-lived and resolve within a few hours.

What to Do If You Feel Unwell After Taking Avanafil

If you experience dizziness, visual changes, or any other side effect that makes you feel unsafe to drive, do not get behind the wheel. Wait until the symptoms have completely resolved and you feel confident in your ability to concentrate and react normally. It is better to delay a journey than to risk your safety or that of others on the road.

If side effects are severe or do not improve, contact your GP or pharmacist for advice. In rare cases, avanafil can cause more serious reactions such as sudden loss of vision or hearing, or an erection lasting more than four hours (priapism). These require urgent medical attention and you should not attempt to drive yourself to hospital—call 999 or ask someone else to take you [6].

Avanafil and Driving: Interactions with Other Medicines

If you take other medicines alongside avanafil, some combinations can increase the risk of side effects that may affect your ability to drive safely. Alpha-blockers (such as tamsulosin, doxazosin, or alfuzosin), which are commonly prescribed for an enlarged prostate or high blood pressure, can interact with avanafil to cause a significant drop in blood pressure [6]. This can lead to dizziness, lightheadedness, or even fainting, particularly when you stand up.

If you are on an alpha-blocker, your prescriber will ensure you are stable on that medicine before starting avanafil, and they will usually recommend the lowest dose of avanafil to minimise risk [6]. You should be especially cautious about driving if you have recently started either medicine or if the dose has been changed. Monitor how you feel and avoid driving if you experience any dizziness or unsteadiness.

Other blood-pressure medicines, such as ACE inhibitors, calcium-channel blockers, or diuretics, can also add to the blood-pressure-lowering effect of avanafil [6]. While this is usually manageable, it can occasionally cause dizziness. Always declare all your current medicines during your online consultation so the prescriber can check for interactions.

Potent CYP3A4 inhibitors—including some antifungals (ketoconazole, itraconazole), certain antibiotics (clarithromycin), and HIV medicines (ritonavir, cobicistat)—can raise avanafil levels in your blood, increasing the risk of side effects [6]. Avanafil is often contraindicated or requires dose adjustment with these medicines. Your prescriber will review your medication list carefully. If you are on any of these, do not take avanafil without explicit approval from a healthcare professional, and be extra vigilant about side effects that could affect driving.

Alcohol, Avanafil, and Driving Safety

Drinking alcohol while taking avanafil can increase the risk of side effects such as dizziness, headache, and low blood pressure [6]. Alcohol is a depressant that can impair your judgement, coordination, and reaction times, and combining it with avanafil may amplify these effects. Heavy drinking can also make erectile dysfunction worse and reduce the effectiveness of the medicine.

If you plan to drink alcohol and take avanafil, keep your intake moderate. The UK Chief Medical Officers recommend no more than 14 units of alcohol per week, spread over at least three days. Even moderate amounts of alcohol can affect your ability to drive safely, and the combination with avanafil may make you feel more lightheaded or unsteady than usual.

It is important to remember that the legal drink-drive limit in England, Wales, and Northern Ireland is 80 milligrams of alcohol per 100 millilitres of blood (35 micrograms per 100 millilitres of breath), and in Scotland it is lower at 50 milligrams per 100 millilitres of blood (22 micrograms per 100 millilitres of breath). Even if you are below the legal limit, alcohol can still impair your driving ability, and adding avanafil into the mix may increase that risk.

The safest approach is to avoid driving if you have consumed alcohol and taken avanafil, especially if you feel at all unwell or dizzy. Plan ahead: if you know you will be drinking, arrange alternative transport or wait until the next day when both the alcohol and any side effects from avanafil have cleared.

Grapefruit Juice and Avanafil

Grapefruit juice can raise the levels of avanafil in your blood by interfering with the enzyme that breaks it down [6]. This can increase the risk of side effects, including those that may affect driving such as dizziness or visual disturbances. It is best to avoid grapefruit juice while taking avanafil, or at least limit your intake and monitor how you feel.

Practical Tips for Taking Avanafil and Driving Safely

To minimise any risk to your driving ability when taking avanafil, follow these practical steps. First, take your initial dose at a time when you do not need to drive—such as in the evening at home—so you can see how your body reacts. Most men experience no problems, but it is sensible to be cautious the first time.

Second, be aware of the timing. Avanafil is a fast-acting medicine, typically taken 15–30 minutes before sexual activity, and its effects can last for several hours [6]. If you plan to drive shortly after taking avanafil, pay close attention to how you feel. If you notice any dizziness, headache, or visual changes, wait until these have completely resolved before getting in the car.

Third, avoid combining avanafil with alcohol or other substances that can impair your ability to drive. If you do drink, keep it moderate and consider not driving at all that day. Similarly, if you are taking other medicines that can cause dizziness or low blood pressure, be extra vigilant and discuss any concerns with your prescriber or pharmacist during your consultation.

Finally, always carry your medicine in its original packaging with the patient information leaflet, especially if you are driving long distances or travelling. This ensures you have access to important safety information and can show it to a healthcare professional if needed. If you ever feel unwell or unsafe to drive after taking avanafil, do not hesitate to pull over, rest, and seek advice if symptoms persist.

When to Seek Medical Advice About Avanafil and Driving

Most men can take avanafil and continue driving without any issues, but there are situations when you should seek medical advice. If you experience persistent or severe dizziness, visual disturbances, or any other side effect that makes you feel unsafe to drive, contact your GP or pharmacist. They can review your dose, check for interactions with other medicines, or suggest an alternative treatment if needed.

If you have a sudden loss of vision in one or both eyes, stop taking avanafil immediately and seek urgent medical help. This is a rare but serious side effect that has been reported with PDE5 inhibitors and may be a sign of a condition called non-arteritic anterior ischaemic optic neuropathy (NAION) [6]. Similarly, sudden hearing loss or ringing in the ears requires prompt medical attention.

An erection lasting more than four hours (priapism) is a medical emergency and requires immediate treatment to prevent permanent damage to the penis [6]. Do not attempt to drive yourself to hospital if this occurs—call 999 or ask someone else to take you. If you experience chest pain during or after sexual activity, stop and seek urgent help, as this could indicate a heart problem.

If you have any concerns about avanafil and driving, or if you are unsure whether it is safe for you to take this medicine given your other health conditions or medications, speak to a healthcare professional. At Cured Pharmacy, every prescription for avanafil is reviewed by a UK-registered prescriber as part of an online consultation, ensuring the treatment is safe and suitable for you. You can also contact the pharmacy team if you have questions after starting treatment.

DVLA Guidance and Avanafil

The Driver and Vehicle Licensing Agency (DVLA) does not specifically list avanafil or other PDE5 inhibitors as medicines that automatically affect your fitness to drive. However, you have a legal duty to inform the DVLA if you have a medical condition or take a medicine that could impair your ability to drive safely. If avanafil causes side effects that affect your driving, you should not drive until those effects have resolved. If side effects are ongoing or severe, discuss this with your doctor, who can advise whether you need to inform the DVLA.

Scientific References

1. Joint Formulary Committee. (n.d.). Avanafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/avanafil/ [accessed 5 November 2026]
2. National Institute for Health and Care Excellence. (2014). Erectile dysfunction: avanafil (ESNM45). https://www.nice.org.uk/advice/esnm45 [accessed 5 November 2026]
3. Electronic Medicines Compendium. (n.d.). Summaries of Product Characteristics and Patient Information Leaflets. https://www.medicines.org.uk/emc/ [accessed 5 November 2026]
4. NHS. (n.d.). Erectile dysfunction (impotence). https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ Accessed 5 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.

Get Treatment in 3 Steps

1

Choose your treatment

Select from our recommended UK-licensed medications.

2

Answer quick questions

Select safe UK treatments. Quick answers.

3

Get it delivered fast

We will deliver direct to you as quickly as tomorrow.