Can You Take Gliclazide With Mounjaro? (October 2026)

01 · The short answer

Can you take gliclazide with Mounjaro?

Yes, a prescriber can combine them, but they will want to plan it with you rather than simply adding one to the other. The Mounjaro safety guidance names sulfonylureas, the group gliclazide belongs to, as medicines to watch when taken alongside it. The reason is low blood sugar, and the guidance says your prescriber may need to adjust those medicines.¹

The combination is not ruled out, but it is not risk-free either. Watch for low blood sugar and expect that your gliclazide may need a review.

Mounjaro is licensed in the UK for weight management in adults and for type 2 diabetes.¹ If you already take gliclazide, you almost certainly have type 2 diabetes and an existing prescriber or diabetes team. Keep them involved. They know your blood sugar history, your other medicines and your usual monitoring routine, and that context is what makes the dose decision a good one.

02 · What to decide

The two decisions you are actually facing

The first decision is whether Mounjaro is relevant to you at all. It is a prescription-only medicine, supplied only after a consultation reviewed by a GPhC-registered prescriber. It is used alongside a reduced-calorie diet and increased physical activity, and individual results vary.¹ If you are on gliclazide because of type 2 diabetes, the conversation should involve whoever manages your diabetes as well.

The second decision is what happens to your gliclazide once Mounjaro begins. Do not decide this alone. Do not stop gliclazide because you have started Mounjaro, and do not carry on at the same dose and hope for the best. Ask your prescriber or pharmacist for a plan before the first injection: whether to review the gliclazide dose, how often to check your blood sugar, and what to do if a reading or a symptom worries you.

The consultation is free and asks about your current medicines, so mention gliclazide there. You can also read about our wider weight loss clinic service.

03 · Why the pair needs care

Why gliclazide and Mounjaro need care together

Both medicines can lower blood sugar, so taking them together can lower it further than either would alone. Gliclazide is a sulfonylurea, the group the Mounjaro guidance singles out. Tirzepatide, the active ingredient in Mounjaro, helps the body respond better to insulin, and in practice that is part of why it is licensed for type 2 diabetes.¹

Put those facts together and the logic is simple. Mounjaro improves how your body handles insulin, while gliclazide is already working on your blood sugar. Adding one to the other can push readings lower than your body or your prescriber expected, which is why the instruction is to watch for low blood sugar and let the prescriber adjust the other medicine if needed.

Prescribers deal with combinations like this regularly. The risk is greatest when nobody has planned for it: when someone starts Mounjaro without telling their diabetes team, or keeps the same gliclazide dose with no extra monitoring. A short conversation up front usually prevents the awkward part.

The patient leaflet also tells you to speak to your doctor, pharmacist or nurse if you take other medicines, and to read the section on low blood sugar.¹³ Keep the leaflet from your pen box and re-read that section when you start and whenever your dose changes.

One more point is easy to miss. Mounjaro also slows how quickly the stomach empties, and many people eat noticeably less in the early weeks.¹ Eating less is often the goal, but it is another reason to talk to your prescriber about how your gliclazide fits with your changing appetite. Your medicines were set for the way you ate before; your prescriber can review them for the way you eat now.

04 · Spotting low blood sugar

What low blood sugar looks like

The Mounjaro guidance describes the warning signs as shakiness, sweating and confusion. If you take insulin or a sulfonylurea alongside Mounjaro, watch for low blood sugar (shakiness, sweating, confusion) — your prescriber may need to adjust those medicines.¹ Learn those three signs now, so you recognise them at the moment they matter rather than reading about them afterwards.

Tell the people around you as well. Confusion is a sign that can make it hard to recognise the problem in yourself. A partner, family member or colleague who knows what to look for can notice a change before you do. That is not an overreaction; it is an ordinary part of living with medicines that can lower blood sugar.

Agree your response with your prescriber or diabetes team before you need it. They know the right way to treat a low reading for your situation and can tell you when a reading or symptom means you should contact them. Write the plan down and keep it where you will find it, for example with your pen supplies or in your phone.

Think about situations that could make a low more likely or harder to manage, such as skipped meals, a day when your appetite has dropped sharply, or travel. Ask your prescriber how to handle each of those. If you drive, ask what they advise about checking your blood sugar before you set off. These are conversations for your own care team because the answers depend on your readings, your routine and the rest of your medicines.

If you have more than one episode of symptoms, or any episode that frightens you, contact your prescriber promptly. They can review your gliclazide dose, and adjusting it is a normal response rather than a failure of the treatment.

05 · What to tell your prescriber

What to tell your prescriber before you start

Give your prescriber a complete medicines list, because the safe plan depends on it. Include gliclazide by name, along with any other diabetes medicine, any insulin, anything bought over the counter and any supplement. Mention gliclazide in the free consultation; a GPhC-registered prescriber reviews your answers and decides whether Mounjaro is suitable for you.

Beyond the list, tell them how your diabetes has been managed recently. If you monitor your blood sugar at home, bring your recent readings. If you have had episodes of low blood sugar in the past, say so. If your diabetes team is separate from the prescriber you will see here, ask how your gliclazide dose will be reviewed and who will make the changes.

Ask these questions directly:

• Does my gliclazide need to change when I start Mounjaro?
• How often should I check my blood sugar in the first weeks?
• Should I expect to review the dose again when I move up a Mounjaro strength?
• What should I do if I feel shaky, sweaty or confused?
• Who do I contact, and how quickly, if something feels wrong?

Mounjaro dose steps are at least 4 weeks on each dose, depending on how you respond, so the review points come naturally with each step. Our aftercare includes ongoing monthly reviews, dose-titration and follow-up assessments by the prescribing team, plus side-effect support, and repeat orders re-check suitability with no auto-shipping.

Support runs Monday to Friday, 9am to 5pm, by email at support@everydaymeds.co.uk, by account chat or by phone on 0333 207 0413. For anything urgent, such as severe stomach pain or signs of a severe allergic reaction, get medical help straight away rather than waiting for office hours.

06 · Mounjaro side effects

Mounjaro side effects to expect and when to act

Most Mounjaro side effects are digestive. The most common, affecting more than 1 in 10 people, are nausea, diarrhoea, vomiting, constipation and abdominal discomfort. Common effects (up to 1 in 10) include indigestion, reduced appetite, dizziness, reflux, burping, hair shedding and injection-site reactions. Side effects are most likely when starting treatment or moving up a dose, and for most people they ease within days to a few weeks as the body adjusts.¹³

Why does this matter for gliclazide? Dizziness is on that common list, and so is reduced appetite. Both can overlap with the way low blood sugar feels or with the conditions that make it more likely. If you feel unwell, do not assume it is just the medicine settling in; run through the low blood sugar signs and your agreed plan, and contact your prescriber if you are unsure.

Some effects need urgent attention. Seek immediate medical help for: severe, persistent stomach pain that may spread to your back, with or without vomiting (possible pancreatitis); pain in the upper right abdomen, fever or yellowing of skin/eyes (possible gallbladder problems); or signs of a severe allergic reaction such as swelling of the face or throat and difficulty breathing.¹ Get medical help straight away if any of these appear; do not wait for a routine appointment.

If you notice a new or lasting symptom that is not listed in the patient leaflet, tell your prescriber or pharmacist. You can also report suspected side effects through the MHRA Yellow Card scheme, which anyone can use.¹⁹ Reporting helps regulators watch the safety of medicines over time.

Digestive effects and your diabetes plan sit side by side. If vomiting or diarrhoea is making it hard to eat or drink, tell your prescriber, because that affects how your other medicines, including gliclazide, should be handled that day. Ask for guidance in advance so you are not improvising when you feel unwell.

07 · Other medicines

Other medicines and Mounjaro

Gliclazide is not the only medicine worth mentioning, and the safest approach is to give your prescriber everything you take. Mounjaro slows stomach emptying, and that has one specific, documented consequence for the contraceptive pill. It can reduce how well oral contraceptive pills are absorbed, and the SmPC advises switching to a non-oral method, or adding a barrier method such as condoms, for 4 weeks after starting Mounjaro and for 4 weeks after each dose increase. This applies to the pill only; implants, coils and injections are unaffected.¹ Mounjaro must not be used during pregnancy, and it should be stopped at least one month before trying to conceive. If you become pregnant during treatment, stop the medicine and tell your prescriber promptly.

For other diabetes treatments, the same principle as with gliclazide applies: your prescriber reviews the whole plan. If you take an SGLT2 medicine, our guide to taking Mounjaro with empagliflozin covers that specific question. If you are dealing with heartburn, see whether Rennies on Mounjaro is something to ask your pharmacist about.

For pain and everyday remedies, our guides on Nurofen and Mounjaro and sumatriptan and Mounjaro go through those individual questions, and zopiclone and Mounjaro covers sleep medicine. Treat each of these as a prompt to check with a pharmacist rather than as a replacement for it.

The question of which medicines cannot be taken with Mounjaro has no single short list that fits everyone. The right answer depends on what you take, your conditions and your doses. The reliable routes are your prescriber, your pharmacist and the patient leaflet, which has a section on other medicines.¹³ Take your full medicines list to any of them.

Supplements deserve the same honesty. Products such as shilajit alongside Mounjaro are not assessed the way prescription medicines are, so always mention them in your consultation, and ask a pharmacist before combining anything new with your diabetes medicines.

08 · NHS and private routes

NHS and private routes if you take gliclazide

Mounjaro is available on the NHS, but access is being phased in over several years. NICE recommends it for adults with a BMI of at least 35 plus at least one weight-related condition, and the NHS primary-care rollout began in June 2025 with the highest-need groups first (initially BMI 40+ with four or more qualifying conditions). Full rollout is expected to take years, which is why many people who meet the licensed criteria choose regulated private treatment rather than waiting.⁴

If your diabetes is managed by your GP or a diabetes clinic, start there. They hold your history and can discuss whether treatment for your diabetes could change, and they can review your gliclazide in that context. The NHS has its own tirzepatide guide that explains what the medicine is and how it is used.⁵

If you choose a private route, the same safety logic applies. Mounjaro is a prescription-only medicine, supplied only after a consultation reviewed by a GPhC-registered prescriber, and our consultation is free. We are a GPhC-registered pharmacy (registration 9012878), and Mounjaro comes through official LillyDirect supply, direct from Eli Lilly's UK distribution, as genuine KwikPens.

Treat a private prescription as an addition to your care, not a separate track. Tell your GP or diabetes team you plan to start, and ask them how they would like your gliclazide and blood sugar monitored. Having everyone aware of the same plan is the surest way to avoid a gap, and it makes dose changes simpler.

Delivery is free next-day tracked in temperature-controlled, discreet packaging, with same-day dispatch when ordered by 3pm. Needles, a sharps bin and injection guidance come with every order.

09 · Storage and routine

Storing your pen and keeping a steady routine

Keep Mounjaro pens in a fridge at 2–8°C and never freeze them. Once in use, a pen can be kept out of the fridge not above 30°C for up to 30 days — useful for short trips — after which it should be discarded. Keep the pen cap on to protect it from light, and never use a pen that has been frozen.¹³

A steady routine helps you read your own body. Inject on the same day each week, in line with your pen's instructions, and keep a simple diary of that day, your meals, your blood sugar readings if you take them, and any symptoms. Our free GLPTrackr companion app, available on iOS and Android, is one place to record a GLP-1 journey, and a notebook works just as well.

That record is useful at every review. If you feel shaky or sweaty, a diary shows your prescriber whether it happens at a particular time, after a particular meal or after a dose change. Pattern information is far easier to act on than a memory of how you felt a few weeks ago.

Bring the diary to your monthly review and to any discussion about your gliclazide. Ask the prescribing team to look at it with you. If a dose increase is due, check in advance whether your plan for low blood sugar needs updating at the same time.

If you ever need to stop Mounjaro, tell your prescriber before you do, and ask what that means for your gliclazide. Tirzepatide has a half-life of about five days, so after a final dose it takes roughly four to five weeks to clear the system, and nothing needs doing while it clears.¹ Your diabetes plan may need another review as it clears, and that review is your prescriber's call.

10 · What Mounjaro does

What Mounjaro does and what to expect

Tirzepatide is the first treatment of its kind to activate two natural gut-hormone receptors at once: GIP and GLP-1. Together these help regulate appetite, slow how quickly the stomach empties, and improve the way the body responds to insulin. In practice, most people feel fuller sooner and less hungry between meals, which supports a reduced-calorie diet.¹

In the SURMOUNT-1 trial of 2,539 adults, people taking tirzepatide alongside diet and exercise lost on average 15% of their body weight on 5mg, 19.5% on 10mg and 20.9% on 15mg over 72 weeks, compared with 3.1% with lifestyle changes alone. These are trial averages — individual results vary, and treatment works alongside a reduced-calorie diet and increased physical activity, not instead of them.²

Trial averages do not predict your own result, and they do not tell you what will happen to your diabetes medicines. Those decisions come from your readings, your prescriber and your own response over time. Mounjaro comes in six strengths, 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg, and the dose steps are at least 4 weeks on each dose, depending on how you respond.

You may find your weight and appetite change before your prescriber has finished reviewing your diabetes plan, so the review needs to keep pace. That is why we encourage you to treat each dose step as a checkpoint: how are your readings, how do you feel, and does gliclazide still fit?

To begin a free consultation, use our Mounjaro consultation page; a GPhC-registered prescriber will review everything you tell them, including gliclazide.