Can You Take Tadalafil and Dihydrocodeine Together?

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Tadalafil and Dihydrocodeine: Understanding the Interaction

Published: 20 October 2026

Many men wonder whether tadalafil and dihydrocodeine can be taken together safely. The good news is that there is no major direct interaction between tadalafil (used for erectile dysfunction) and dihydrocodeine (an opioid painkiller), but your prescriber will still need to review your full medication list and health conditions to ensure the combination is suitable for you. Both medicines can cause side effects that may overlap, so a careful assessment is essential before starting treatment.

What is tadalafil and how does it work?

Tadalafil is a prescription medicine used to treat erectile dysfunction (ED) in men. It belongs to a group of medicines called PDE5 inhibitors, which work by relaxing the blood vessels in the penis, allowing increased blood flow when you are sexually aroused [4]. Tadalafil does not cause an erection on its own—sexual stimulation is still needed.

Tadalafil is available in two forms: on-demand tablets (usually 10mg or 20mg) taken at least 30 minutes before sexual activity, with effects lasting up to 36 hours, and daily tablets (2.5mg or 5mg) taken once a day at the same time [4]. The longer duration of action is why tadalafil is sometimes called 'the weekend pill'. It is the generic version of the branded medicine Cialis.

Common side effects of tadalafil include headache, indigestion, back pain, muscle aches, flushing, and a blocked or runny nose [4]. These are usually mild and temporary. Tadalafil can also lower blood pressure slightly, which is important when considering other medicines you may be taking.

What is dihydrocodeine and why is it prescribed?

Dihydrocodeine is a prescription-only opioid painkiller used to treat moderate to severe pain that cannot be managed with simpler painkillers like paracetamol or ibuprofen. It works by binding to opioid receptors in the brain and spinal cord, changing the way your body perceives and responds to pain. Dihydrocodeine is available in immediate-release tablets (30mg) and modified-release tablets (60mg, 90mg, 120mg) for longer-lasting pain relief.

Common side effects of dihydrocodeine include constipation, nausea, drowsiness, dizziness, and dry mouth. Because it is an opioid, dihydrocodeine can cause dependence if used for long periods, so it is usually prescribed for short-term use or under careful supervision. Dihydrocodeine can also lower blood pressure and cause sedation, particularly when you first start taking it or if the dose is increased.

If you are taking dihydrocodeine regularly for a pain condition, it is important to tell your prescriber before starting any new medicine, including treatments for erectile dysfunction. Your prescriber will need to consider how the medicines might affect each other and whether any dose adjustments or extra monitoring are needed.

Is there an interaction between tadalafil and dihydrocodeine?

There is no major direct pharmacological interaction between tadalafil and dihydrocodeine that would make the combination unsafe in most cases. However, both medicines can cause side effects that may add together, particularly dizziness and low blood pressure. Dihydrocodeine can cause drowsiness and lightheadedness, especially when you first start taking it, and tadalafil can lower blood pressure slightly by relaxing blood vessels [4].

When these effects combine, some men may feel more dizzy or faint, particularly when standing up quickly. This is more likely if you are also taking other medicines that lower blood pressure, if you drink alcohol, or if you are dehydrated. The risk is generally manageable, but it is important that your prescriber knows about all your current medicines so they can assess your individual situation.

Your prescriber will also consider whether your pain condition or the underlying cause of your pain might affect your suitability for tadalafil. For example, if you have significant cardiovascular disease or if sexual activity is inadvisable for other health reasons, tadalafil may not be appropriate regardless of the dihydrocodeine [2]. The online consultation process ensures that all these factors are reviewed before treatment is approved.

What your prescriber will check

During your consultation, the prescriber will ask about your current medicines (including dihydrocodeine), your blood pressure, any heart or circulation problems, and whether you experience dizziness or fainting. They will also ask about your pain condition and overall health to ensure tadalafil is safe and suitable for you. If you are stable on dihydrocodeine and have no other concerning health issues, tadalafil can usually be prescribed, often starting with a lower dose to see how you tolerate it. Always answer the consultation questions fully and honestly to ensure your safety.

Practical advice for taking tadalafil and dihydrocodeine together

If your prescriber approves the combination of tadalafil and dihydrocodeine, there are some practical steps you can take to minimise the risk of side effects. Firstly, avoid standing up too quickly, especially after sitting or lying down for a while, as this can trigger dizziness. If you feel lightheaded, sit or lie down until the feeling passes. Make sure you are well hydrated, as dehydration can make low blood pressure worse.

Limit alcohol intake when taking either medicine, as alcohol can increase drowsiness, dizziness, and the blood-pressure-lowering effect. Heavy drinking can also make erectile dysfunction worse and reduce the effectiveness of tadalafil [1]. If you are taking the on-demand form of tadalafil, consider timing it when you are not due to take a dose of dihydrocodeine, although this is not always necessary—follow your prescriber's advice.

Do not take more tadalafil than prescribed, and never take it more than once a day. If you experience severe dizziness, fainting, chest pain during sex, or an erection lasting more than four hours, seek urgent medical help. Keep both medicines in their original packaging, out of reach of children, and do not share them with anyone else. If you have any concerns or new symptoms, contact your GP or pharmacist for advice.

Other medicines and conditions that affect tadalafil safety

While tadalafil and dihydrocodeine do not have a major direct interaction, there are some medicines that must never be taken with tadalafil because they can cause a dangerous drop in blood pressure. These include nitrates (such as GTN spray, isosorbide mononitrate or dinitrate), nicorandil, riociguat, and recreational drugs called 'poppers' (amyl or alkyl nitrites). Do not take tadalafil with any of these medicines or substances [4].

Alpha-blockers (such as tamsulosin, doxazosin, or alfuzosin, often used for prostate symptoms) can also lower blood pressure and increase the risk of dizziness when combined with tadalafil. If you take an alpha-blocker, your prescriber will usually start you on the lowest dose of tadalafil and ensure you are stable on the alpha-blocker first [4]. Some medicines that affect liver enzymes (such as ritonavir, ketoconazole, or clarithromycin) can raise tadalafil levels in the blood, requiring dose adjustments.

Tadalafil is not suitable if you have had a recent heart attack or stroke, have unstable angina, severe heart failure, very low blood pressure, or a history of sudden vision loss (non-arteritic anterior ischaemic optic neuropathy, or NAION) [2][4]. Your prescriber will ask about these conditions during the consultation. If you are unsure whether a medicine or condition affects tadalafil, always declare it in your consultation—it is better to check than to risk your safety.

When to see your GP about erectile dysfunction

If you are experiencing erectile dysfunction for the first time, it is a good idea to see your GP for a face-to-face assessment. ED can be an early warning sign of underlying health conditions such as heart disease, diabetes, or high blood pressure [1][2]. Your GP can arrange blood tests, check your cardiovascular health, and discuss any lifestyle factors that may be contributing. Once any serious causes have been ruled out or managed, you can use a convenient online service like Cured Pharmacy for ongoing treatment if appropriate.

How to get tadalafil safely from Cured Pharmacy

Cured Pharmacy is a GPhC-registered online pharmacy (GPhC 9012511) offering a range of erectile dysfunction treatments, including tadalafil, after a clinical consultation reviewed by a UK-registered prescriber. The process is straightforward: you complete a short online health questionnaire, which is reviewed by a prescriber who checks your suitability for treatment, including any interactions with medicines like dihydrocodeine. If approved, your medicine is dispensed by our pharmacy team and delivered discreetly to your door.

We offer both generic and branded tadalafil, as well as other PDE5 inhibitors such as sildenafil, vardenafil, and avanafil, so you can choose the treatment that best suits your needs and budget. All consultations are confidential, and our team is available to answer any questions you may have about your treatment. If tadalafil is not suitable for you, the prescriber will explain why and may suggest an alternative if appropriate.

Remember, you should never buy prescription medicines without a valid prescription or from unregistered sources, as these may be counterfeit, unsafe, or ineffective. Using a registered pharmacy like Cured ensures you receive genuine, licensed medicines and professional clinical oversight. If you have any questions about tadalafil and dihydrocodeine or any other aspect of your treatment, our pharmacy team is here to help.

Starting your consultation

To start your consultation, visit the Cured Pharmacy website and select the erectile dysfunction treatment you are interested in. You will be asked to provide information about your health, current medicines (including dihydrocodeine), and any medical conditions. Answer all questions fully and accurately—this ensures the prescriber can make a safe decision. If you are unsure about any question, you can contact our team for guidance. Once your consultation is reviewed and approved, your treatment will be on its way, usually within one working day.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 20 October 2026]
2. National Institute for Health and Care Excellence. (n.d.). Erectile dysfunction. Clinical Knowledge Summaries. https://cks.nice.org.uk/topics/erectile-dysfunction/ [accessed 20 October 2026]
3. Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 20 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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