Vardenafil and Lithium: Can They Be Taken Together?

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At a glance

What is vardenafil and lithium used for?

Vardenafil is a prescription medicine licensed in the UK to treat erectile dysfunction (ED). 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're sexually aroused [3][5]. Vardenafil is the generic version of Levitra and is typically taken about 25 to 60 minutes before sexual activity. It's available in 5mg, 10mg, and 20mg strengths, and you should take it no more than once a day. Like all PDE5 inhibitors, vardenafil requires sexual stimulation to work—it won't cause an erection on its own.

Lithium is a mood stabiliser prescribed for bipolar disorder and, in some cases, severe depression. It works by affecting the balance of certain chemicals in the brain that influence mood and behaviour. Lithium requires careful monitoring because the therapeutic range is narrow—blood levels that are too low may not control symptoms, while levels that are too high can cause toxicity. Regular blood tests are essential when you're taking lithium, and your doctor will check kidney function, thyroid function, and lithium levels to keep you safe [12].

Is there an interaction between vardenafil and lithium?

No major direct interaction between vardenafil and lithium is commonly reported in the medical literature or standard drug interaction databases. Vardenafil is primarily broken down in the liver by an enzyme called CYP3A4, while lithium is eliminated unchanged by the kidneys and does not significantly interact with liver enzymes [5][12]. This means the two medicines are processed by different pathways in the body, reducing the likelihood of one affecting the levels of the other.

However, it's important to understand that 'no major interaction reported' does not mean the combination is automatically suitable for everyone. Your prescriber will still need to review your full medical history, current medicines, and any other health conditions during your consultation. Lithium itself does not typically cause erectile dysfunction, but the underlying condition it treats—bipolar disorder—and other medicines you may be taking alongside lithium can sometimes contribute to ED. Your prescriber will consider all these factors to ensure vardenafil is safe and appropriate for you.

What your prescriber will check

During your online consultation at Cured Pharmacy, you'll be asked to list every medicine you're currently taking, including lithium, any other prescription medicines, over-the-counter products, and supplements. Your prescriber will check for any contraindications—such as nitrates, nicorandil, riociguat, or another PDE5 inhibitor—and assess whether vardenafil is suitable given your cardiovascular health, blood pressure, and kidney or liver function. If you're on lithium, your prescriber may also want to know whether your lithium levels are stable and whether you're under regular monitoring by your GP or psychiatrist. This thorough review ensures that vardenafil can be prescribed safely in your individual case.

Other medicines that can interact with vardenafil

While vardenafil and lithium do not have a significant direct interaction, vardenafil does interact importantly with several other classes of medicine. You must never take vardenafil with nitrates (such as GTN spray, isosorbide mononitrate, or isosorbide dinitrate), nicorandil, riociguat, or amyl/alkyl nitrites (poppers), because the combination can cause a dangerous drop in blood pressure [5]. Do not take vardenafil together with another PDE5 inhibitor (such as sildenafil, tadalafil, or avanafil) on the same day.

Alpha-blockers (such as doxazosin, tamsulosin, alfuzosin, or terazosin) used for prostate symptoms or high blood pressure can also lower blood pressure when combined with vardenafil, increasing the risk of dizziness or fainting. If you're on an alpha-blocker, you should be stable on that medicine before starting vardenafil, and your prescriber will usually recommend the lowest dose of vardenafil initially [5]. Potent CYP3A4 inhibitors—including ritonavir, cobicistat, Paxlovid, ketoconazole, itraconazole, and clarithromycin—can raise vardenafil levels significantly. Vardenafil is contraindicated or should be avoided with these medicines; your prescriber will check the summary of product characteristics (SmPC) if you're taking any of them [5][12]. CYP3A4 inducers such as rifampicin, carbamazepine, phenytoin, and St John's wort can reduce vardenafil's effectiveness.

What you need to know

• No major direct interaction between vardenafil and lithium is commonly reported
• Always declare lithium and all other medicines during your ED consultation
• Never take vardenafil with nitrates, nicorandil, riociguat, poppers, or another PDE5 inhibitor
• Continue lithium monitoring and contact your doctor if you develop new symptoms
• Cured Pharmacy offers UK prescriber-led consultations for vardenafil and other ED treatments

Practical advice when taking vardenafil and lithium together

If your prescriber approves vardenafil while you're on lithium, take vardenafil exactly as directed—usually about 25 to 60 minutes before you plan to have sex, and no more than once in 24 hours. Swallow the tablet whole with water; you can take it with or without food, though a very heavy or high-fat meal may delay how quickly it works [5]. Continue taking your lithium exactly as your doctor has prescribed, at the same time each day, and do not miss doses or stop it without medical advice. Lithium requires regular blood monitoring, so keep all your scheduled appointments for blood tests and check-ups.

Avoid drinking large amounts of alcohol when using vardenafil, as alcohol can worsen erectile dysfunction and add to the blood-pressure-lowering effect, increasing the risk of dizziness or headache. Grapefruit juice can raise vardenafil levels and should be avoided. Stay well hydrated, especially in hot weather or if you're exercising, because dehydration can affect lithium levels. If you develop any new symptoms—such as dizziness, fainting, tremor, confusion, or signs of lithium toxicity (such as severe nausea, vomiting, diarrhoea, or unsteadiness)—contact your GP or specialist immediately. If you experience an erection lasting more than four hours, sudden loss of vision or hearing, or chest pain during sex, seek urgent medical help [5][12].

When to contact your doctor

Contact your GP or specialist if you notice any new or worsening symptoms after starting vardenafil, particularly if you feel dizzy, faint, or unwell. If you develop signs that might suggest lithium toxicity—such as severe tremor, confusion, slurred speech, muscle weakness, or persistent vomiting—seek medical advice the same day. Do not stop taking lithium suddenly without your doctor's guidance, as this can lead to relapse of your mood disorder. If you're unsure whether a symptom is related to vardenafil, lithium, or another cause, it's always safer to ask a healthcare professional for advice.

Can lithium or bipolar disorder affect erectile function?

Lithium itself is not commonly associated with causing erectile dysfunction, but the condition it treats—bipolar disorder—can affect sexual function in several ways. During depressive episodes, low mood, fatigue, and reduced libido are common and can contribute to difficulties with erections. During manic or hypomanic episodes, sexual behaviour and desire may change, but the quality of erections can still be affected by other factors such as sleep disturbance, stress, or the use of other medicines [1][2].

Other medicines sometimes prescribed alongside lithium—such as antipsychotics, antidepressants, or benzodiazepines—can also contribute to erectile dysfunction. If you're taking multiple medicines for your mental health, it's important to discuss all of them during your consultation. Your prescriber will consider the full picture, including your mood stability, overall health, and any cardiovascular risk factors, before recommending vardenafil or another ED treatment. If ED is a new problem for you, it's worth seeing your GP for a full assessment, as erectile dysfunction can sometimes be an early sign of underlying conditions such as diabetes or heart disease [1][2].

When to get urgent help

• Erection lasting more than 4 hours (priapism) – go to A&E immediately
• Sudden loss of vision or hearing – seek urgent medical help
• Chest pain during or after sex – call 999
• Severe tremor, confusion, slurred speech, or persistent vomiting (possible lithium toxicity) – contact your GP or call 111 the same day
• Severe dizziness or fainting – seek medical advice urgently

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

How Cured Pharmacy can help with vardenafil and lithium

At Cured Pharmacy, we offer a straightforward online consultation service for erectile dysfunction treatments, including vardenafil. Our consultations are reviewed by UK-registered prescribers who will assess your medical history, current medicines (including lithium), and overall health to ensure vardenafil is safe and suitable for you. If approved, your medicine is dispensed by our GPhC-registered pharmacy (GPhC 9012511) and delivered discreetly to your door. We stock a range of ED treatments, including vardenafil (generic Levitra) at £16.95, or £13.56 for your first order with code Ednew.

If vardenafil is not suitable for you, our prescribers can discuss alternatives such as sildenafil (from £0.45, or £0.36 with code Ednew), tadalafil (from £7.95, or £6.36 with code Ednew), or avanafil (Spedra, £20.95, or £16.76 with code Ednew). All our ED medicines are genuine, UK-licensed treatments, and every prescription is reviewed individually. If you have questions about taking vardenafil with lithium or any other medicine, our pharmacy team is here to help. Remember, if you're experiencing erectile dysfunction for the first time, we encourage you to see your GP for a full assessment, as ED can be an early indicator of other health conditions that need attention [1][2].

Starting your consultation

To begin, simply complete our online medical questionnaire, listing all your current medicines including lithium, any other health conditions, and relevant medical history. A UK prescriber will review your answers and, if appropriate, approve a prescription for vardenafil or suggest an alternative treatment. The process is confidential, and your medicine arrives in plain, discreet packaging. If you're unsure about any part of the consultation or have questions about vardenafil and lithium, you can contact our pharmacy team for advice before you order.

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