Tadalafil and Alprazolam: Can They Be Taken Together?
Learn about the interaction, what your prescriber checks, and how to use both medicines safely.
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Tadalafil and Alprazolam: Understanding the Interaction
Published: 18 October 2026
Many men wonder whether tadalafil and alprazolam can be taken together safely. Tadalafil is a PDE5 inhibitor used to treat erectile dysfunction, while alprazolam (commonly known by the brand name Xanax) is a benzodiazepine prescribed for anxiety and panic disorders. Although there is no absolute contraindication to using these medicines together, both can lower blood pressure, and combining them requires careful consideration by your prescriber to ensure the combination is safe for you.
Key takeaways
- Tadalafil and alprazolam can usually be taken together, but both may lower blood pressure.
- Your prescriber will review all your medicines to ensure the combination is safe for you.
- Avoid excessive alcohol and stand up slowly to reduce the risk of dizziness.
- Always declare alprazolam and all other medicines during your online consultation.
- Seek urgent help if you experience chest pain, prolonged erection, or sudden vision or hearing loss.
What Is Tadalafil and How Does It Work?
Tadalafil is a prescription medicine licensed in the UK for the treatment of erectile dysfunction (ED). It belongs to a group of medicines called phosphodiesterase type 5 (PDE5) inhibitors, which work by relaxing the blood vessels in the penis, allowing increased blood flow when you are sexually aroused [3][4].
Tadalafil is available as both on-demand tablets (10mg or 20mg, taken at least 30 minutes before sexual activity, with effects lasting up to 36 hours) and daily low-dose tablets (2.5mg or 5mg). It does not cause an erection on its own—sexual stimulation is still needed [4]. Common brand names include Cialis, but generic tadalafil is widely available and equally effective.
Because tadalafil works by dilating blood vessels, it can cause a modest drop in blood pressure. This effect is usually mild and well-tolerated, but it becomes important when tadalafil is combined with other medicines that also affect blood pressure [4].
What Is Alprazolam and Why Is It Prescribed?
Alprazolam is a benzodiazepine medicine used to treat anxiety disorders and panic attacks. In the UK, it is a controlled drug (Class C, Schedule 4) and is prescribed when other treatments have not been effective. Benzodiazepines work by enhancing the effect of a neurotransmitter called GABA in the brain, which has a calming effect and reduces anxiety.
Alprazolam can cause side effects including drowsiness, dizziness, reduced coordination, and in some cases, a mild lowering of blood pressure. It is usually prescribed for short-term use because of the risk of dependence and tolerance with long-term treatment.
Men with anxiety may be prescribed alprazolam, and anxiety itself is a recognised psychological contributor to erectile dysfunction [1][2]. It is not uncommon for men to be taking both an anxiety medicine and considering treatment for ED, which is why understanding the interaction between tadalafil and alprazolam is important.
Anxiety and Erectile Dysfunction
Anxiety and stress are common psychological causes of erectile dysfunction. Performance anxiety, relationship worries, and generalised anxiety can all interfere with sexual arousal and the ability to achieve or maintain an erection [1][2]. Treating the underlying anxiety may improve ED symptoms, but many men benefit from both psychological support and ED medication.
At a glance
Can Tadalafil and Alprazolam Be Taken Together?
There is no absolute contraindication to taking tadalafil and alprazolam together—they are not in the same category as dangerous combinations such as tadalafil with nitrates or nicorandil, which must never be used together. However, both medicines can lower blood pressure and cause dizziness, so the combination requires careful assessment by your prescriber.
When you request tadalafil through an online consultation at Cured Pharmacy, you will be asked to list all your current medicines, including alprazolam. A UK-registered prescriber will review your medical history, current medications, and overall health to decide whether tadalafil is safe for you. If you are stable on alprazolam and have no other risk factors, tadalafil may be prescribed, often starting at a lower dose to minimise the risk of side effects.
It is essential that you declare alprazolam (and any other benzodiazepine or sedative) during your consultation. Do not stop taking alprazolam or change your dose without speaking to the doctor who prescribed it, as benzodiazepines should not be stopped suddenly.
How Do Tadalafil and Alprazolam Interact?
The main concern when combining tadalafil and alprazolam is the additive effect on blood pressure. Tadalafil relaxes blood vessels, which can cause a small drop in blood pressure. Alprazolam can also lower blood pressure slightly and cause dizziness or drowsiness, particularly when you first start taking it or if the dose is increased.
When both medicines are taken together, there is a higher chance of experiencing dizziness, light-headedness, or feeling faint, especially when standing up quickly (a phenomenon called postural hypotension). This risk is generally manageable, but it is more pronounced in men who are also taking other blood-pressure-lowering medicines, who are dehydrated, or who drink alcohol.
There is no significant pharmacokinetic interaction—alprazolam does not affect how your body processes tadalafil, and tadalafil does not affect alprazolam levels. The interaction is pharmacodynamic, meaning the combined effects on your cardiovascular system need to be considered [3][4].
What Your Prescriber Will Check
Before prescribing tadalafil, your prescriber will review your full medication list, including the dose of alprazolam, how long you have been taking it, and whether you have experienced any side effects such as dizziness. They will also ask about your blood pressure, heart health, and any other conditions. If you are stable on alprazolam and your blood pressure is normal, tadalafil is usually considered safe, often starting with a lower dose such as 10mg on-demand or 2.5mg daily [2][4].
Stand Up Slowly
If you take tadalafil and alprazolam together, be especially careful when standing up from sitting or lying down, as this is when dizziness is most likely. Take your time and hold onto something stable if needed.
Practical Advice for Taking Tadalafil and Alprazolam Together
If your prescriber approves the combination, there are several practical steps you can take to minimise the risk of side effects. First, take tadalafil exactly as prescribed—do not exceed the recommended dose or take it more often than once a day (for on-demand tablets). If you are taking daily tadalafil, stick to the same time each day.
Be cautious when standing up, especially after sitting or lying down for a while, as this is when dizziness is most likely to occur. Avoid drinking large amounts of alcohol, as alcohol can worsen both erectile dysfunction and the blood-pressure-lowering effects of both medicines. Stay well-hydrated, particularly in hot weather or after exercise.
If you experience persistent dizziness, light-headedness, or fainting, stop taking tadalafil and contact your GP or the prescriber who issued it. Do not drive or operate machinery if you feel drowsy or dizzy. If you develop chest pain during sexual activity, stop immediately and seek urgent medical help—do not take nitrate medicines (GTN spray) if you have used tadalafil in the past 48 hours, as this can cause a dangerous drop in blood pressure [3][4].
Other Medicines and Tadalafil: What Else Should You Know?
Beyond alprazolam, there are several other medicine interactions with tadalafil that are important to be aware of. Never take tadalafil with nitrates (such as GTN spray, isosorbide mononitrate, or isosorbide dinitrate), nicorandil, riociguat, or recreational drugs known as 'poppers' (amyl or alkyl nitrites). These combinations can cause a severe and potentially life-threatening drop in blood pressure [3][4].
Alpha-blockers (such as tamsulosin, doxazosin, or alfuzosin, often prescribed for prostate symptoms) can also interact with tadalafil, increasing the risk of low blood pressure. If you take an alpha-blocker, your prescriber will ensure you are stable on it before starting tadalafil, usually at the lowest dose. Potent CYP3A4 inhibitors (such as ritonavir, ketoconazole, itraconazole, or clarithromycin) can raise tadalafil levels in your blood, requiring dose adjustments [4].
Always declare every medicine you take—prescription, over-the-counter, herbal, and recreational—during your consultation. Your prescriber and pharmacist will check for interactions and ensure tadalafil is safe for you. Do not stop or change any prescribed medicine without professional advice.
When to See Your GP
If you are experiencing erectile dysfunction for the first time, it is important to see your GP for a full assessment. ED can be an early warning sign of cardiovascular disease or diabetes, and your GP can check your blood pressure, cholesterol, blood sugar, and overall heart health [1][2]. Online consultations are suitable for ongoing treatment or when you have already been assessed, but a face-to-face review is recommended for new or worsening symptoms.
When to get urgent help
- Chest pain during or after sexual activity—stop and call 999; do not take nitrate medicines.
- An erection lasting more than 4 hours (priapism)—go to A&E immediately to prevent permanent damage.
- Sudden loss of vision in one or both eyes—stop tadalafil and seek urgent medical attention.
- Sudden decrease or loss of hearing, possibly with ringing in the ears—stop tadalafil and see a doctor urgently.
- Severe dizziness, fainting, or signs of very low blood pressure—sit or lie down and seek same-day medical advice.
Call 999 or go to A&E in an emergency, or contact NHS 111 for urgent advice.
Scientific References
- NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 18 October 2026]
- National Institute for Health and Care Excellence. (n.d.). Erectile dysfunction. Clinical Knowledge Summaries. https://cks.nice.org.uk/topics/erectile-dysfunction/ [accessed 18 October 2026]
- Joint Formulary Committee. (n.d.). Sildenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/sildenafil/ [accessed 18 October 2026]
- Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 18 October 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.
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Is it safe to take tadalafil and alprazolam together?
There is no absolute contraindication, but both medicines can lower blood pressure and cause dizziness. Your prescriber will review your full medical history and current medications to ensure the combination is safe for you.
Will alprazolam make tadalafil less effective?
No, alprazolam does not reduce the effectiveness of tadalafil. However, anxiety itself can contribute to erectile dysfunction, so treating anxiety may improve your overall response to ED treatment.
Can I drink alcohol if I'm taking tadalafil and alprazolam?
It is best to limit alcohol, as it can worsen erectile dysfunction and add to the blood-pressure-lowering and sedative effects of both medicines, increasing the risk of dizziness and drowsiness.
What should I do if I feel dizzy after taking tadalafil and alprazolam?
Sit or lie down until the dizziness passes. Avoid standing up quickly. If dizziness is severe or persistent, stop taking tadalafil and contact your GP or prescriber for advice.
Do I need to tell my prescriber about alprazolam when requesting tadalafil?
Yes, you must declare all current medicines, including alprazolam, during your online consultation. This allows the prescriber to check for interactions and ensure tadalafil is safe for you.
Can I take tadalafil if I'm also on an SSRI for anxiety?
Yes, there is no major interaction between tadalafil and SSRIs (such as sertraline or citalopram). Your prescriber will review all your medicines during the consultation.
What are the warning signs that I should stop taking tadalafil?
Stop taking tadalafil and seek urgent help if you experience chest pain during sex, an erection lasting more than 4 hours, sudden loss of vision or hearing, or severe dizziness or fainting.
How do I request tadalafil from Cured Pharmacy if I take alprazolam?
Complete the online consultation, listing alprazolam and any other medicines you take. A UK-registered prescriber will review your information and, if appropriate, issue a prescription for tadalafil.
Medically reviewed by
Tarun Kumar, Superintendent Pharmacist (GPhC 2233073)