Does Venlafaxine Cause Erectile Dysfunction?

Yes. Venlafaxine can cause erectile dysfunction (ED), and it happens more often than the leaflet suggests. The official product information lists ED as a common side effect, meaning it affects between 1 in 100 and 1 in 10 people. When researchers ask patients directly, sexual problems of some kind show up in about 2 in 3 people taking it. You can usually manage this safely without stopping your treatment on your own.

Why the leaflet and the studies disagree#

Leaflet figures come mostly from clinical trials. In those trials, people often had to raise sexual problems themselves, and few did.

A large Spanish study by Montejo and colleagues (2001) asked 1,022 people directly. Of those taking venlafaxine, 67% reported some form of sexual dysfunction. That was similar to SSRIs such as sertraline and paroxetine. Mirtazapine was much lower, at about 24%.

The leaflet's "common" label is a frequency band (between 1 in 100 and 1 in 10 people), not a precise estimate of how many men get ED. Studies that ask directly, including Montejo's, report erection problems separately from other sexual problems, and the figures vary between studies. The two numbers measure different things. The leaflet band covers ED, while the 67% covers every kind of sexual problem, including delayed orgasm and low desire. Direct questioning also tends to find more problems than trials where people have to volunteer them.

Erections, orgasm and desire are separate problems#

Venlafaxine can affect more than erections. Working out which problem you have matters, because the fixes differ.

In studies of SSRIs and SNRIs, delayed orgasm and low desire are reported at least as often as erection problems. Many men have more than one.

How venlafaxine affects erections#

Venlafaxine is an SNRI, meaning it raises levels of serotonin and noradrenaline in the brain. Extra serotonin is thought to damp down dopamine, which drives arousal, and to slow the reflexes behind orgasm. Extra noradrenaline is thought to tighten blood vessels, working against the relaxed blood flow an erection needs.

Venlafaxine can also raise blood pressure, and the rise is larger at higher doses. It should not be used if your blood pressure is uncontrolled. Your prescriber should check it before you start and during treatment, especially after a dose increase.

Most people take 75–225mg a day. Doses up to 375mg are mainly used for severe depression, usually as immediate-release tablets under specialist or hospital care.

Is it the venlafaxine or something else?#

Depression and anxiety can cause ED on their own. These clues help, though only a GP can confirm the cause:

• Timing. ED that began within weeks of starting venlafaxine, or after a dose rise, points to the medicine.
• Morning erections. If you still wake with them, your nerves and blood supply are probably working.
• Pattern. Problems only with a partner suggest anxiety. Problems every time, including alone, suggest the medicine or a physical cause.
• Risk factors. Smoking, diabetes, high blood pressure and high cholesterol point to a blood vessel cause.

Blood vessel ED can be an early warning of heart disease. If you are 40 to 74 in England, an NHS Health Check covers these risks. A few weeks of brief notes on when problems happen makes the GP chat easier.

Does it settle with time?#

Some early side effects, like nausea, often fade within a few weeks. Sexual side effects tend to hang around for many people, so it is worth raising them with your prescriber rather than waiting for them to pass.

After a supervised taper off venlafaxine, sexual function usually returns within weeks. Rarely, problems carry on for months or years after stopping. This is called post-SSRI sexual dysfunction (PSSD), and UK product information now mentions it. You can report any side effect through the MHRA Yellow Card scheme.

Taking sildenafil or tadalafil with venlafaxine#

No important interaction is expected between venlafaxine and these ED tablets. A Cochrane review (Taylor and colleagues, 2013) found sildenafil helped erections in men with antidepressant-related ED. Evidence for tadalafil is smaller but encouraging.

• Sildenafil: usually 50mg about 1 hour before sex, adjusted to 25–100mg. It works for around 4–5 hours. A heavy meal slows it down.
• Tadalafil: usually 10mg, up to 20mg, and works for up to 36 hours. A low 5mg daily dose is another option.

These tablets are not suitable for everyone. Check first if any of these apply:

• You use nitrates (such as GTN spray) or riociguat. Never combine these with ED tablets.
• You take alpha-blockers like doxazosin or tamsulosin, or other blood pressure medicines. Your pressure could drop too far.
• You take strong CYP3A4 inhibitors, such as clarithromycin, itraconazole or some HIV medicines. These raise ED tablet levels.
• You had a heart attack or stroke in the last 6 months, or have unstable heart disease.
• Your blood pressure is very low or uncontrolled.
• You have ever lost sight in one eye because of non-arteritic anterior ischaemic optic neuropathy (NAION), or you have a rare inherited eye condition such as retinitis pigmentosa.
• You have severe liver or kidney problems.
• You have a condition that makes prolonged erections (priapism) more likely, such as sickle cell disease, leukaemia or myeloma.
• You have a physical deformity of the penis, such as angulation, cavernosal fibrosis or Peyronie's disease.

Common side effects are headache, flushing, a blocked nose and dizziness. Because venlafaxine can raise blood pressure, a pharmacist will ask about your readings.

NHS prescribing of ED tablets is generally limited to men with certain conditions, such as diabetes or after prostate surgery. It can also be offered for severe distress. Most men get them privately or from a pharmacist. Viagra Connect (sildenafil 50mg) is sold in pharmacies to men aged 18 and over after a short chat. Online pharmacies, including Totiva's ED service, ask similar health questions. Always check an online pharmacy on the GPhC register, as the MHRA regularly seizes fake ED pills.

Lowering the dose or switching medicine#

Any dose change or switch must be planned with your prescriber. A lower dose can sometimes ease sexual side effects if your mood is stable.

Do not skip doses before sex. Venlafaxine leaves the body fast (a half-life of about 5 hours), so missing even one day can trigger withdrawal. That can mean dizziness, "brain zaps", irritability and flu-like symptoms.

If ED tablets do not help, or the problem is orgasm or desire, a switch may be discussed.

Bupropion, often mentioned in US articles, is only licensed in the UK for stopping smoking. NICE guidance says switches should be agreed together and done gradually, usually over several weeks. Talking therapy can also help, and in England you can self-refer to NHS Talking Therapies.

Speak to a pharmacist or GP if ED is affecting your relationship. Do the same if you want to stop venlafaxine. Also mention delayed orgasm or low desire, as these need different help. GPs hear about sexual side effects all the time.

Signs you need help today#

• An erection lasting more than 4 hours: go to A&E.
• Chest pain or breathlessness during sex: call 999.
• Sudden loss of sight or hearing after an ED tablet: get urgent help.
• Thoughts of suicide or harming yourself: call 999 or NHS 111 (option 2 in England). You can also call Samaritans on 116 123 or text SHOUT to 85258.

If your mood is stable and you want to try an ED tablet, you can start a free consultation. A UK clinician decides whether it suits you, and you only pay after approval.