Vardenafil and Lurasidone: Can They Be Taken Together?

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Key takeaways

• Vardenafil and lurasidone can usually be taken together but require careful prescriber review.
• Both medicines can affect heart rhythm and blood pressure, so start with the lowest vardenafil dose.
• Declare all medicines during your consultation, including lurasidone and any other antipsychotics.
• Watch for dizziness, palpitations, or fainting—stop vardenafil and seek advice if these occur.
• Never stop or change your lurasidone dose without advice from your prescribing doctor.

What Is Vardenafil and How Does It Work?

Vardenafil (also known by the brand name Levitra) is a prescription medicine used to treat erectile dysfunction in men [5]. It belongs to a group of medicines called PDE5 inhibitors, which work by relaxing blood vessels in the penis, allowing increased blood flow when you are sexually aroused. Vardenafil does not cause an erection on its own—sexual stimulation is still needed for the medicine to work.

Vardenafil is available in 5mg, 10mg, and 20mg tablets and is usually taken about 25 to 60 minutes before sexual activity [5]. The effect can last for several hours, but you should not take more than one dose in 24 hours. Common side effects include headache, flushing, indigestion, and nasal congestion. Like all PDE5 inhibitors, vardenafil can lower blood pressure slightly, which is why it must never be taken with nitrates, nicorandil, riociguat, or poppers—this combination can cause a dangerous drop in blood pressure [5].

Vardenafil is broken down in the body by liver enzymes, particularly one called CYP3A4. This means that medicines which affect this enzyme can change how much vardenafil stays in your system, making interactions an important consideration. Your prescriber will review all your current medicines, including lurasidone, before prescribing vardenafil to ensure the combination is safe for you.

What Is Lurasidone and Why Is It Prescribed?

Lurasidone is an antipsychotic medicine used to treat schizophrenia in adults and adolescents aged 13 years and over, and also to treat episodes of depression associated with bipolar disorder [12]. It works by helping to restore the balance of certain natural chemicals (neurotransmitters) in the brain, particularly dopamine and serotonin. Lurasidone is taken once daily with food (at least 350 calories) to help your body absorb it properly.

Like vardenafil, lurasidone can affect your heart rhythm and blood pressure. It may cause a slight prolongation of the QT interval on an ECG (a measure of the heart's electrical activity), and it can also lower blood pressure, especially when you stand up quickly (orthostatic hypotension). These effects are usually mild, but they become more important when lurasidone is combined with other medicines that have similar effects, such as vardenafil.

Lurasidone is also broken down by the same liver enzyme (CYP3A4) that processes vardenafil. This shared metabolic pathway is the key reason why your prescriber needs to review the combination carefully. While the two medicines are not absolutely contraindicated together, the interaction requires dose adjustments and monitoring to ensure your safety.

At a glance

Can You Take Vardenafil and Lurasidone Together?

Vardenafil and lurasidone are not contraindicated together, meaning they can be prescribed at the same time, but the combination requires careful prescriber assessment [5][12]. The main concern is that both medicines can affect your heart rhythm and blood pressure. Lurasidone may prolong the QT interval (the time it takes for your heart to recharge between beats), and vardenafil can also have a mild effect on the QT interval. When combined, there is a theoretical risk of an abnormal heart rhythm, although this is uncommon at normal doses.

Both medicines can also lower your blood pressure. Lurasidone may cause dizziness or light-headedness when you stand up, and vardenafil lowers blood pressure as part of how it works. Taking them together could add to this effect, increasing your risk of feeling dizzy or faint, particularly when you first start treatment or if your dose is increased. Your prescriber will check your medical history, current blood pressure, and any heart conditions before approving the combination.

It is important to understand that no major interaction is commonly reported between vardenafil and lurasidone in routine clinical use, but individual responses vary. Your prescriber will consider your overall health, other medicines you take, and any risk factors for heart problems. Never stop or change your lurasidone dose to take vardenafil—always discuss ED treatment with the prescriber who manages your mental health condition, or ensure your online consultation includes full details of your lurasidone prescription.

How the Interaction Works in Plain English

Both vardenafil and lurasidone are processed by the same enzyme in your liver (CYP3A4). When you take them together, they compete for this enzyme, which can mean that levels of one or both medicines may be slightly higher in your bloodstream than if you took them alone. Higher levels can increase the chance of side effects, particularly those affecting your heart rhythm and blood pressure. Your prescriber may recommend starting with the lowest effective dose of vardenafil (usually 5mg) and monitoring how you respond before considering any increase.

What Your Prescriber Will Check Before Approving Vardenafil

When you request vardenafil through an online consultation at Cured Pharmacy, the UK-registered prescriber will review your full medical history and all current medicines, including lurasidone [5]. They will ask about any heart conditions, recent heart attack or stroke, blood pressure problems, and whether you have ever experienced an abnormal heart rhythm. If you have a history of QT prolongation or are taking other medicines that affect the QT interval, the prescriber may advise against vardenafil or recommend an alternative ED treatment.

The prescriber will also check your current dose of lurasidone and how long you have been taking it. If you are stable on lurasidone with no side effects, and your blood pressure is well controlled, the prescriber is more likely to approve a low starting dose of vardenafil. They will advise you to watch for warning signs such as dizziness, fainting, palpitations (a racing or irregular heartbeat), or chest discomfort, and to stop taking vardenafil and seek medical advice if these occur.

You must declare every medicine you take during your consultation, including over-the-counter medicines, herbal remedies, and recreational drugs. Do not assume that because vardenafil and lurasidone can be taken together in some cases, the combination is automatically safe for you. Each consultation is individualised, and the prescriber's decision is based on your unique circumstances. Prescription ED medicines are only supplied after this clinical review has been completed by a UK prescriber.

Other Medicines That May Affect Vardenafil Levels

Because vardenafil is broken down by CYP3A4, other medicines that strongly inhibit this enzyme can raise vardenafil levels significantly. Potent CYP3A4 inhibitors include ritonavir, cobicistat (used in some HIV medicines), ketoconazole, itraconazole, and clarithromycin [5]. If you take any of these, vardenafil may be contraindicated or require a much lower dose. Conversely, CYP3A4 inducers such as rifampicin, carbamazepine, phenytoin, and St John's wort can reduce vardenafil levels and make it less effective. Always list every medicine during your consultation so the prescriber can check for these interactions.

Practical Advice for Taking Vardenafil with Lurasidone

If your prescriber approves vardenafil while you are taking lurasidone, start with the lowest dose (usually 5mg) and take it as directed—typically 25 to 60 minutes before sexual activity [5]. Take vardenafil on an empty stomach or after a light meal, as a heavy or high-fat meal can delay how quickly it works. Continue taking your lurasidone exactly as prescribed by your psychiatrist or GP, with food, and do not change the dose or timing without medical advice.

Be cautious when standing up quickly, especially in the first few hours after taking vardenafil, as both medicines can lower your blood pressure. Sit on the edge of the bed for a moment before standing, and avoid sudden changes in posture. Limit alcohol when using vardenafil, as heavy drinking can worsen erectile dysfunction, increase the risk of side effects such as dizziness and headache, and add to the blood-pressure-lowering effect. Avoid grapefruit juice, which can raise vardenafil levels in your blood.

Monitor yourself for any unusual symptoms. If you experience a fast, slow, or irregular heartbeat, chest pain, severe dizziness, fainting, or an erection lasting more than four hours, stop taking vardenafil and seek urgent medical help. If you develop new side effects after starting vardenafil, contact your GP or the prescriber who issued the prescription. Do not stop lurasidone without advice from the doctor who prescribed it, as stopping antipsychotic medicines suddenly can cause withdrawal symptoms or a relapse of your condition.

Alternative ED Treatments If Vardenafil Is Not Suitable

If your prescriber decides that vardenafil and lurasidone together pose too high a risk for you, there are other options for treating erectile dysfunction. Sildenafil (generic Viagra) and tadalafil (generic Cialis) are also PDE5 inhibitors and share similar interactions with lurasidone, so they would require the same careful assessment [3][4]. However, tadalafil has a longer half-life and may be preferred in some cases because it can be taken daily at a low dose (2.5mg or 5mg), which may result in more stable blood levels and fewer peaks that could interact with lurasidone.

Avanafil (Spedra) is another PDE5 inhibitor that works more quickly than vardenafil or sildenafil, but it is also metabolised by CYP3A4 and has similar precautions [6]. Non-oral treatments such as Eroxon gel (a topical medical device available without prescription) or Vitaros cream (alprostadil, prescription-only) work locally and do not have the same systemic interactions with lurasidone, so they may be safer alternatives if your prescriber has concerns about your heart rhythm or blood pressure [7].

Lifestyle changes can also help improve erectile function and may reduce your need for medication. Regular exercise, a healthy diet, maintaining a healthy weight, stopping smoking, and reducing alcohol intake all support better erections and overall cardiovascular health [1][2]. If ED is a new problem for you, see your GP for a full assessment, as it can be an early warning sign of heart disease or diabetes. Your GP can also liaise with your psychiatrist to ensure any ED treatment is safe alongside your mental health medicines.

When to See Your GP About Erectile Dysfunction

You should see your GP if you have persistent or recurrent erectile dysfunction, especially if it is a new problem or getting worse [1]. ED can be an early sign of underlying health conditions such as diabetes, high blood pressure, high cholesterol, or heart disease. Your GP can arrange blood tests, check your cardiovascular health, and review all your medicines (including lurasidone) to identify any contributing factors. They can also refer you to a specialist if needed and work with your psychiatrist to coordinate safe treatment.

When to get urgent help

• An erection lasting more than 4 hours (priapism)—go to A&E immediately
• Sudden chest pain during or after sex—call 999
• Severe dizziness, fainting, or a fast/irregular heartbeat—seek urgent medical advice
• Sudden loss of vision or hearing—stop vardenafil and go to A&E
• Signs of a severe allergic reaction (swelling of face/throat, difficulty breathing)—call 999

Call 999 or go to A&E in an emergency, or contact NHS 111 for urgent advice.

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