Tadalafil and Ertugliflozin: Can They Be Taken Together?

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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 phosphodiesterase type 5 (PDE5) inhibitors [3][4]. Tadalafil works by relaxing the blood vessels in the penis, allowing more blood to flow in when you are sexually aroused. This increased blood flow helps you achieve and maintain an erection suitable for sexual activity.

Tadalafil is available in two forms: on-demand tablets (usually 10mg or 20mg taken at least 30 minutes before sex, with effects lasting up to 36 hours) and daily low-dose tablets (2.5mg or 5mg taken once a day) [4]. The medicine only works when you are sexually stimulated—it does not cause an automatic erection. Tadalafil is the active ingredient in branded Cialis and is also available as a more affordable generic medicine.

Common side effects include headache, indigestion, back pain, muscle aches, flushing, and a blocked or runny nose [4]. These are usually mild and temporary. Tadalafil must not be taken with nitrates, nicorandil, riociguat, or recreational drugs called 'poppers', as this combination can cause a dangerous drop in blood pressure.

What Is Ertugliflozin and Why Is It Prescribed?

Ertugliflozin is a prescription medicine used to treat type 2 diabetes. It is sold under the brand name Steglatro and is also available in combination tablets (Steglujan contains ertugliflozin plus sitagliptin; Segluromet contains ertugliflozin plus metformin). Ertugliflozin belongs to a class of diabetes medicines called sodium-glucose co-transporter 2 (SGLT2) inhibitors.

SGLT2 inhibitors work by helping your kidneys remove excess glucose (sugar) from your blood through your urine [12]. This lowers blood sugar levels and can also lead to modest weight loss and a small reduction in blood pressure. Ertugliflozin is usually taken once daily in the morning, with or without food. It is often prescribed alongside other diabetes medicines such as metformin or insulin.

Common side effects of ertugliflozin include genital yeast infections (thrush), urinary tract infections, and increased urination [12]. Because the medicine causes your body to pass more urine, staying well hydrated is important. Rarely, SGLT2 inhibitors can cause a serious condition called diabetic ketoacidosis, so your doctor will monitor you carefully, especially if you become unwell or need surgery.

The Link Between Diabetes and Erectile Dysfunction

Men with type 2 diabetes are significantly more likely to experience erectile dysfunction than men without diabetes [1][10]. High blood sugar levels over time can damage the blood vessels and nerves that control erections. In fact, ED can sometimes be an early warning sign of undiagnosed diabetes or cardiovascular disease, which is why the NHS recommends seeing your GP if you develop new erection problems [1].

Good diabetes control—through diet, exercise, and medicines like ertugliflozin—can help reduce the risk of ED and improve overall vascular health. Many men with diabetes benefit from ED treatment with medicines like tadalafil, provided their diabetes and any other health conditions are well managed.

When to get urgent help

• Erection lasting more than 4 hours (priapism) – call 999 or go to A&E immediately
• Sudden loss of vision in one or both eyes – seek urgent medical help
• Sudden decrease or loss of hearing, possibly with ringing in the ears or dizziness
• Chest pain during or after sexual activity – stop and seek medical advice; do not take nitrates
• Symptoms of diabetic ketoacidosis: severe thirst, frequent urination, nausea, vomiting, stomach pain, fast breathing, confusion, or unusual tiredness

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

Tadalafil and Ertugliflozin: Is There an Interaction?

No major direct drug interaction between tadalafil and ertugliflozin is commonly reported in clinical practice or listed in standard UK prescribing references [3][4][12]. This means that, in general, these two medicines can be taken together under appropriate medical supervision. However, both medicines can affect your blood pressure and fluid balance, so your prescriber will assess your individual situation carefully.

Tadalafil can cause a mild drop in blood pressure, especially when you first start taking it or if you are also on other blood-pressure-lowering medicines [4]. Ertugliflozin can also reduce blood pressure slightly because it causes your body to lose fluid through increased urination [12]. When taken together, these effects could add up, potentially causing dizziness or light-headedness, particularly when standing up quickly.

Your prescriber will check your current blood pressure, review all your medicines (including any for high blood pressure or heart conditions), and ensure you are well hydrated before approving tadalafil. If you are stable on ertugliflozin and your blood pressure is well controlled, tadalafil is usually considered safe to use. Always declare every medicine you take—prescription, over-the-counter, and herbal—during your consultation.

What Your Prescriber Checks Before Approving Tadalafil

Before prescribing tadalafil to someone taking ertugliflozin, a UK prescriber will conduct a thorough clinical assessment [2]. They will ask about your diabetes control, current blood sugar levels, and any complications such as nerve damage or kidney problems. They will also check your blood pressure and ask about any history of heart disease, stroke, or other cardiovascular conditions.

The prescriber will review all your current medicines to identify any that could interact with tadalafil. This includes checking for nitrates (such as GTN spray or isosorbide mononitrate), nicorandil, riociguat, alpha-blockers (like tamsulosin or doxazosin), and any medicines that affect liver enzymes [3][4]. If you take an alpha-blocker for prostate symptoms, you must be stable on it, and you will usually start on the lowest dose of tadalafil.

You will also be asked about your general health, including any history of priapism (prolonged erections), eye problems (especially sudden vision loss), severe liver or kidney disease, or recent heart attack or stroke [4]. Tadalafil is not suitable if sexual activity is inadvisable due to your heart condition. The prescriber will also discuss lifestyle factors such as alcohol intake, smoking, and exercise, all of which can affect both diabetes and erectile function.

Starting Tadalafil Safely on Ertugliflozin

If you are approved for tadalafil while taking ertugliflozin, your prescriber may recommend starting with a lower dose to see how you tolerate it [4]. For on-demand use, this is often 10mg taken at least 30 minutes before sexual activity. For daily use, a 2.5mg or 5mg tablet taken at the same time each day may be suggested.

You should monitor for any signs of low blood pressure, such as dizziness, light-headedness, or feeling faint, especially when standing up. Make sure you are drinking enough water, as ertugliflozin increases urination and dehydration can worsen side effects. If you experience any unusual symptoms, contact your prescriber or pharmacist for advice.

At a glance

Practical Advice for Taking Tadalafil and Ertugliflozin Together

Take each medicine exactly as prescribed. Ertugliflozin is usually taken once daily in the morning, while tadalafil can be taken either on-demand (at least 30 minutes before sex, with effects lasting up to 36 hours) or daily at the same time each day [4][12]. You can take tadalafil with or without food, though a very large or high-fat meal may delay its effect slightly.

Stay well hydrated, especially because ertugliflozin increases urination. Dehydration can increase the risk of dizziness and may worsen side effects from both medicines. Limit alcohol intake, as heavy drinking can make erectile dysfunction worse and add to the blood-pressure-lowering effects of tadalafil [4]. Avoid grapefruit juice, which can increase tadalafil levels in your blood.

Monitor your blood sugar levels as advised by your diabetes team. While tadalafil does not directly affect blood sugar, sexual activity itself can lower glucose levels, so be aware of this if you are on insulin or other diabetes medicines that can cause hypoglycaemia. Keep all your follow-up appointments with your GP or diabetes nurse to ensure both your diabetes and any cardiovascular risk factors are well controlled.

Warning Signs and When to Seek Help with Tadalafil and Ertugliflozin

Most men tolerate tadalafil and ertugliflozin together without problems, but you should be aware of warning signs that need urgent attention. If you develop an erection lasting more than four hours (priapism), seek emergency help immediately by calling 999 or going to A&E [4]. Priapism is a medical emergency that can cause permanent damage if not treated quickly.

Seek urgent medical help if you experience sudden loss of vision in one or both eyes, or sudden decrease or loss of hearing, which may be accompanied by ringing in the ears or dizziness [4]. These are rare but serious side effects. If you develop chest pain during or after sexual activity, stop and seek medical advice—do not take nitrate medicines (such as GTN spray) if you have used tadalafil in the past 48 hours, as this combination is dangerous.

Contact your GP or diabetes team promptly if you develop symptoms of diabetic ketoacidosis while on ertugliflozin, such as feeling very thirsty, passing urine more often, feeling sick, being sick, stomach pain, fast or deep breathing, confusion, or unusual tiredness [12]. Also seek advice if you develop signs of a serious genital infection (Fournier's gangrene), such as severe pain, tenderness, redness, or swelling in the genital or perineal area, along with fever or feeling generally unwell—this is very rare but requires immediate treatment.

Reporting Side Effects

If you experience any side effects while taking tadalafil and ertugliflozin, talk to your doctor or pharmacist. This includes any possible side effects not listed in the patient information leaflet. You can also report side effects directly via the UK Yellow Card scheme at www.mhra.gov.uk/yellowcard or search for 'MHRA Yellow Card' in the Google Play or Apple App Store. Reporting helps improve the safety information available about medicines.

In summary

• No major direct interaction between tadalafil and ertugliflozin is commonly reported.
• Both medicines can lower blood pressure slightly, so your prescriber checks this carefully.
• Stay well hydrated, as ertugliflozin increases urination and dehydration worsens side effects.
• Declare all your medicines during your consultation, including diabetes and blood pressure treatments.
• Seek urgent help for erections lasting over four hours or sudden vision or hearing loss.

Frequently Asked Questions

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