Tadalafil and Dulaglutide: Can You Take Them Together?

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Key takeaways

• No major direct interaction is reported between tadalafil and dulaglutide—many men take them together safely.
• Your prescriber will check your diabetes control, heart health, and other medicines before prescribing tadalafil.
• Good blood sugar control improves erectile function and makes ED treatment more effective.
• Never take tadalafil with nitrates, nicorandil, riociguat, or poppers—this combination is dangerous.
• Seek urgent help for an erection lasting over 4 hours or sudden vision or hearing loss.

What is tadalafil and dulaglutide?

Tadalafil is a phosphodiesterase type 5 (PDE5) inhibitor licensed in the UK to treat erectile dysfunction (ED) [4]. It works by relaxing blood vessels in the penis, allowing increased blood flow when you are sexually aroused. Tadalafil is available as an on-demand tablet (usually 10 mg or 20 mg taken at least 30 minutes before sex, with effects lasting up to 36 hours) or as a daily low-dose tablet (2.5 mg or 5 mg) [4]. It is the active ingredient in branded Cialis and is also available as a generic medicine.

Dulaglutide (brand name Trulicity) is a glucagon-like peptide-1 (GLP-1) receptor agonist used to treat type 2 diabetes [12]. It is given as a once-weekly injection under the skin and helps lower blood sugar by increasing insulin release, slowing stomach emptying, and reducing appetite. Dulaglutide does not directly affect blood pressure or the enzymes that break down tadalafil, which is why the two medicines do not have a major known interaction.

How do tadalafil and dulaglutide interact?

There is no major direct pharmacological interaction between tadalafil and dulaglutide [2][4]. Dulaglutide does not inhibit or induce the liver enzyme (CYP3A4) responsible for breaking down tadalafil, so it does not significantly raise or lower tadalafil levels in the blood. Similarly, tadalafil does not interfere with how dulaglutide works to control blood sugar.

However, both medicines are used in the context of diabetes, which is an important consideration. Type 2 diabetes is a well-known risk factor for erectile dysfunction because high blood sugar can damage blood vessels and nerves over time [1][2]. Men with poorly controlled diabetes may find that ED treatments are less effective. Your prescriber will want to ensure your diabetes is well managed and that you do not have complications—such as severe cardiovascular disease or diabetic neuropathy—that might make sexual activity inadvisable or affect the safety of tadalafil [2][4].

Why diabetes matters for ED treatment

Diabetes is one of the most common causes of erectile dysfunction in the UK [1][10]. High blood glucose levels can damage the small blood vessels and nerves that control erections, making it harder to achieve or maintain an erection even with medication. Good blood sugar control, a healthy diet, regular exercise, and not smoking all improve the effectiveness of ED treatments like tadalafil [1][2]. If you are taking dulaglutide, it is a sign that you and your doctor are actively managing your diabetes, which is a positive step for both your general health and your sexual health.

At a glance

What your prescriber checks before combining tadalafil and dulaglutide

Before prescribing tadalafil to someone taking dulaglutide, a UK prescriber will review your full medical history and current medicines [2][4]. They will check that you are not taking any medicines that are contraindicated with tadalafil—such as nitrates (GTN spray, isosorbide mononitrate or dinitrate), nicorandil, riociguat, or recreational drugs called 'poppers' (amyl or alkyl nitrites). Taking tadalafil with any of these can cause a dangerous drop in blood pressure and you must not take them together [3][4].

Your prescriber will also ask about other medicines that can interact with tadalafil, including alpha-blockers (such as tamsulosin or doxazosin, often used for prostate symptoms), other blood-pressure medicines, and drugs that affect how the liver processes tadalafil (such as some antibiotics, antifungals, or HIV medicines) [4]. They will assess your cardiovascular health, because sexual activity places demands on the heart and tadalafil can lower blood pressure slightly [2][4]. If you have had a recent heart attack or stroke, unstable angina, severe heart failure, or very low blood pressure, tadalafil may not be suitable.

Because you are taking dulaglutide for diabetes, your prescriber will want to know how well your blood sugar is controlled, whether you have any diabetes-related complications (such as kidney disease, nerve damage, or eye problems), and whether you have ever experienced sudden vision loss (a rare condition called non-arteritic anterior ischaemic optic neuropathy, or NAION) [2][4]. All of this information helps ensure that tadalafil is safe and appropriate for you.

Practical advice for taking tadalafil with dulaglutide

If your prescriber approves tadalafil, you can take it on the same day as your dulaglutide injection without any special timing required. Dulaglutide is given once a week, while tadalafil is taken either daily (at a low dose) or on-demand before sexual activity [4]. There is no need to separate the two medicines by a certain number of hours.

Take tadalafil exactly as prescribed. For on-demand use, take one tablet at least 30 minutes before you plan to have sex; the effect can last up to 36 hours, so you do not need to rush [4]. For daily tadalafil, take one tablet at the same time each day, regardless of when you plan to have sex. Tadalafil requires sexual stimulation to work—it will not cause an erection on its own.

Continue taking dulaglutide as prescribed by your diabetes specialist or GP. Do not stop or change the dose without medical advice. Good diabetes control improves the effectiveness of ED treatment and reduces your risk of complications [1][2]. Avoid drinking large amounts of alcohol, as heavy drinking can worsen erectile dysfunction and add to the blood-pressure-lowering effect of tadalafil, increasing the risk of dizziness [4]. Grapefruit juice can raise tadalafil levels in the blood, so it is best to avoid it or limit your intake.

Lifestyle measures that help

Lifestyle changes can make a real difference to erectile dysfunction, especially when you have diabetes [1][2]. Losing weight if you are overweight, eating a balanced diet low in sugar and saturated fat, taking regular physical activity (aim for 150 minutes of moderate exercise per week), stopping smoking, and reducing alcohol all improve blood sugar control, cardiovascular health, and erectile function [1]. These measures work alongside tadalafil and dulaglutide to give you the best chance of successful treatment.

Warning signs and when to seek help with tadalafil and dulaglutide

Most men tolerate tadalafil well, but you should be aware of warning signs that need urgent medical attention [4]. If you develop an erection that lasts longer than four hours (priapism), go to A&E immediately or call 999. Priapism is a medical emergency that can cause permanent damage if not treated quickly. If you experience sudden loss of vision in one or both eyes, stop taking tadalafil and seek urgent medical help, as this may be a sign of NAION [4]. Sudden decrease or loss of hearing, sometimes with ringing in the ears or dizziness, also requires prompt medical assessment.

If you develop chest pain during or after sex, stop the activity, sit down, and seek medical help [4]. Do not take GTN or any nitrate medicine if you have used tadalafil in the past 48 hours, as the combination can cause a dangerous drop in blood pressure. Tell the paramedics or doctor that you have taken tadalafil. Common side effects of tadalafil include headache, indigestion, back pain, muscle aches, flushing, and a stuffy or runny nose [4]. These are usually mild and temporary. If side effects are troublesome or persistent, speak to your prescriber or pharmacist.

For dulaglutide, be aware of signs of low blood sugar (hypoglycaemia) if you also take other diabetes medicines such as insulin or a sulfonylurea. Symptoms include sweating, shaking, fast heartbeat, confusion, and feeling very hungry [12]. Dulaglutide alone rarely causes hypos, but the combination with other diabetes drugs can increase the risk. If you experience severe abdominal pain that does not go away, this could be a sign of pancreatitis and you should seek medical advice urgently.

Getting tadalafil and dulaglutide: the consultation process

Dulaglutide is a prescription-only medicine for type 2 diabetes, usually initiated and monitored by your GP or diabetes specialist. Tadalafil is also a prescription-only medicine in most doses, though a 10 mg tablet (Cialis Together) is available from pharmacies after a consultation for men aged 18 and over [2][4]. At Cured Pharmacy, a GPhC-registered online pharmacy, you can request tadalafil through a confidential online consultation reviewed by a UK-registered prescriber.

During the consultation, you will be asked about your medical history, current medicines (including dulaglutide), any heart or blood-pressure problems, and other health conditions. Be honest and thorough—this information is essential to ensure tadalafil is safe for you. The prescriber will check for contraindications and interactions, and if tadalafil is suitable, a prescription will be issued and your medicine dispensed by a UK pharmacist. Your dulaglutide prescription will continue to be managed by your usual doctor, and you should attend regular diabetes reviews as recommended.

If you have not seen a doctor about erectile dysfunction before, it is a good idea to discuss it with your GP [1][2]. ED can be an early warning sign of cardiovascular disease or poorly controlled diabetes, and your GP can arrange tests (such as blood pressure, cholesterol, and HbA1c) and review your overall health. Treating the underlying cause—such as improving diabetes control with medicines like dulaglutide—can sometimes improve erectile function on its own, and combining this with tadalafil often gives the best results.

Why an online consultation is convenient and confidential

Many men find it easier to discuss erectile dysfunction through a confidential online consultation rather than face-to-face. At Cured Pharmacy, the process is straightforward: you complete a health questionnaire, a UK prescriber reviews your answers, and if appropriate, your medicine is dispensed and delivered discreetly to your home. The same safety checks apply as in a GP surgery or high-street pharmacy, ensuring you receive safe, effective treatment. You can continue to collect your dulaglutide from your usual pharmacy and order tadalafil online when you need it.

When to get urgent help

• Erection lasting longer than 4 hours (priapism)—go to A&E or call 999 immediately
• Sudden loss of vision in one or both eyes—stop tadalafil and seek urgent medical help
• Sudden decrease or loss of hearing, with or without ringing in the ears or dizziness
• Chest pain during or after sex—stop activity, sit down, and call 999; do not take nitrates if you have used tadalafil in the past 48 hours
• Severe abdominal pain that does not go away (possible pancreatitis from dulaglutide)—contact your GP or call 111

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