Can you take Mounjaro and Wegovy together?
Absolutely not. For most people, Mounjaro and Wegovy should not be used at the same time. Wegovy product information says semaglutide should not be used with other semaglutide-containing products or any other GLP-1 receptor agonist. Mounjaro is tirzepatide, a long-acting GIP and GLP-1 receptor agonist. Combining them could increase side effects such as nausea, vomiting, diarrhoea, dehydration and low blood sugar risk in susceptible people, without being a normal or recommended way to improve weight loss. [1][3][4]
If you are switching between Mounjaro and Wegovy, or from another GLP-1 medicine such as Ozempic or Saxenda, follow the switching plan given by your prescriber. Do not create an overlap period, double dose, add a second injection, split pens, or use leftover medication to ‘bridge’ treatment unless your prescriber has told you to.
The main interaction risks at a glance
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Medicine or situation
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Examples
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Why it matters
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What to do
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Other GLP-1 or incretin medicines
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Wegovy with Mounjaro, Ozempic, Saxenda, Rybelsus or another GLP-1-type medicine
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Do not combine unless explicitly prescribed. It can increase treatment duplication and side-effect risk.
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Ask the prescriber before switching, overlapping or adding another treatment. [1][3]
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Insulin and sulfonylureas
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Insulin, gliclazide, glimepiride and similar diabetes medicines
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Higher risk of hypoglycaemia, especially in people with diabetes.
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Prescriber may adjust diabetes medicine doses and ask for blood glucose monitoring. [1][2][3][4][5]
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Oral contraceptives
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Combined pill or progestogen-only pill
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Mounjaro can reduce and delay exposure to oral contraceptive hormones after starting and dose increases. Wegovy is not expected to reduce oral contraceptive effectiveness based on product information.
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For Mounjaro, use barrier contraception or switch to non-oral contraception for 4 weeks after starting and 4 weeks after each dose increase if you have obesity or overweight. [1][2][3]
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Oral medicines needing precise levels
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Warfarin, digoxin, some anti-seizure medicines, lithium and similar narrow-therapeutic-index medicines
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Delayed stomach emptying may alter absorption timing or peak levels. Wegovy PIL specifically flags warfarin-like anticoagulants for possible blood testing.
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Tell the prescriber or pharmacist. Extra monitoring may be needed when starting or increasing dose. [1][3][4]
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Medicines needing rapid onset
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Pain relief for acute pain, migraine medicine, rescue medicines, some antibiotics or short-course medicines
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If absorption is delayed, the medicine may take longer to work.
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Ask a pharmacist or prescriber if timing matters or if symptoms are not responding as expected. [1][3]
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Antibiotics
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Any prescribed antibiotic
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There is not one blanket antibiotic interaction, but vomiting, diarrhoea or delayed absorption may affect treatment in some situations.
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Do not skip antibiotics. Ask the prescriber/pharmacist if you cannot keep doses down, symptoms worsen, or the antibiotic must act quickly. [1][3][6]
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Blood pressure medicines
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Ramipril, lisinopril, losartan, amlodipine, diuretics
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Not usually the central listed interaction, but dehydration, reduced intake and weight loss may change blood pressure or kidney-risk context.
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Contact your prescriber if you get persistent dizziness, faintness, very low blood pressure readings, or dehydration. [2][4][6]
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Painkillers and anti-inflammatory medicines
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Paracetamol, ibuprofen, naproxen, aspirin
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Paracetamol has specific Mounjaro data and usually does not need adjustment. NSAIDs/aspirin need usual caution, especially with dehydration, stomach symptoms, kidney disease or blood thinners.
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Ask a pharmacist if you have vomiting, diarrhoea, kidney disease, stomach ulcer history, anticoagulants or regular aspirin use. [1][6][9][10]
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Alcohol
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Beer, wine, spirits
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Not a classic drug-drug interaction, but alcohol can worsen nausea, vomiting, dehydration and blood sugar instability.
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Avoid heavy drinking. Be especially cautious if you have diabetes, vomiting, poor intake or recurrent hypos. [5][6]
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Surgery or sedation
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General anaesthesia, deep sedation, planned procedures
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Delayed stomach emptying may increase residual stomach contents before anaesthesia or sedation.
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Tell the hospital, surgeon, anaesthetist or dentist that you use Mounjaro or Wegovy. [2][3][4]
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Why Mounjaro and Wegovy can interact with other medicines
Mounjaro and Wegovy are used once weekly, but they are not identical medicines. Mounjaro contains tirzepatide, which acts on GIP and GLP-1 receptors. Wegovy contains semaglutide, a GLP-1 receptor agonist. Both can reduce appetite and affect digestion, and both can influence blood glucose control. [1][3]
Two mechanisms matter most for interactions. First, they can slow gastric emptying, which means medicines taken by mouth may reach the intestine more slowly. For most routine medicines this may not be clinically important, but it can matter when a medicine has a narrow therapeutic index, must be absorbed predictably, or needs to work quickly. [1][3]
Second, they can lower blood glucose. On their own, this does not mean every patient will have low blood sugar. The risk becomes more important when they are used alongside insulin or medicines that stimulate insulin release, such as sulfonylureas. [1][2][3][4]
Mounjaro interactions to know about
Insulin and sulfonylureas
If you take insulin or a sulfonylurea such as gliclazide or glimepiride, Mounjaro can increase the risk of low blood sugar. The Mounjaro SmPC says this risk may be lowered by reducing the dose of insulin or the insulin secretagogue, and the patient leaflet advises blood glucose testing as instructed by the clinician. Do not reduce or stop diabetes medicines by yourself; ask the prescriber managing your diabetes plan. [1][2][5]
Oral contraceptives
Mounjaro has a specific contraceptive interaction warning. The SmPC reports reduced and delayed exposure to a combined oral contraceptive after a single 5 mg tirzepatide dose. For women with obesity or overweight, reduced oral contraceptive efficacy cannot be excluded. The eMC advice is to switch to a non-oral contraceptive method, or add a barrier method, for 4 weeks after starting Mounjaro and for 4 weeks after each dose increase. [1][2]
Oral medicines, warfarin and digoxin
Mounjaro delays gastric emptying and may affect the rate of absorption of oral medicines. The SmPC says no dose adjustment is expected for most oral medicines, but recommends monitoring medicines with a narrow therapeutic index, including examples such as warfarin and digoxin, especially when starting tirzepatide and after dose increases. [1]
Paracetamol, ibuprofen and aspirin
Mounjaro product information includes a paracetamol study and says no dose adjustment of paracetamol is necessary. That does not automatically make every painkiller equally straightforward. Ibuprofen, naproxen and aspirin carry their own cautions, particularly around stomach irritation, kidney problems, bleeding risk, dehydration and blood-thinning medicines. If you are vomiting, have diarrhoea, are dehydrated, have kidney disease, take anticoagulants, or take aspirin for heart or stroke prevention, ask a pharmacist or prescriber before changing pain relief. [1][6][9][10]
Wegovy interactions to know about
Other GLP-1 medicines
Wegovy should not be used with another semaglutide-containing medicine or with another GLP-1 receptor agonist. This is the clearest answer to many searches about mixing Wegovy with Mounjaro, Ozempic, Saxenda or similar treatments. If you are switching, the prescriber should decide the timing and starting dose. [3]Insulin and sulfonylureas
The Wegovy SmPC says insulin and sulfonylureas are known to cause hypoglycaemia in people with diabetes and that the risk may increase when semaglutide is used with them. A reduction in insulin or sulfonylurea dose may be considered when semaglutide is started. That decision needs to be made by the clinician responsible for your diabetes care. [3][4][5]
Oral medicines and warfarin-like anticoagulants
Wegovy may delay gastric emptying and could potentially influence oral medicine absorption. The SmPC says no clinically relevant drug-drug interactions were seen with the evaluated oral medicines and that no dose adjustment is required when co-administered with semaglutide. However, the Wegovy patient leaflet specifically tells patients to mention warfarin or similar oral anticoagulants because more frequent blood testing may be required when starting treatment. [3][4]
Oral contraceptives
Wegovy is different from Mounjaro on this point. The Wegovy SmPC says semaglutide is not anticipated to decrease oral contraceptive effectiveness, based on exposure data for ethinylestradiol and levonorgestrel. If you vomit or have severe diarrhoea, follow the missed-pill or sickness advice for your contraceptive and ask a pharmacist or clinician if unsure. [3]
Specific medicines people commonly ask about
Can you take ramipril or lisinopril with Mounjaro or Wegovy?
Ramipril and lisinopril are not the main interaction warnings highlighted in the Mounjaro or Wegovy interaction sections. The practical issue is context. If treatment causes vomiting, diarrhoea, poor fluid intake, dizziness, low blood pressure symptoms, or rapid changes in weight, your blood pressure medicine may need review. This is especially relevant if you also take a diuretic, have kidney disease, or have diabetes. Do not stop ramipril or lisinopril without medical advice. [2][4][6]
Can you take antibiotics with Mounjaro or Wegovy?
There is no single rule that says antibiotics cannot be taken with Mounjaro or Wegovy. The bigger concerns are whether you can keep the antibiotic down, whether vomiting or diarrhoea is severe, whether the infection is getting worse, and whether the antibiotic needs a reliable or rapid effect. If you vomit soon after taking a dose, miss doses, cannot keep fluids down, or feel more unwell, contact the prescriber or pharmacist. [1][3][6]
Can you take antidepressants with Mounjaro or Wegovy?
Antidepressants are not a simple yes/no category because the answer depends on the exact medicine, dose, side effects, mental-health history and any other medicines you take. Many people may be able to use antidepressants and weight-management treatment under clinical supervision. However, appetite, nausea, sleep, mood and weight changes can overlap with antidepressant effects, so tell your prescriber if your mood worsens, side effects change, or your medication feels less effective.
What vitamins or supplements should not be taken with Mounjaro?
There is no useful evidence-based ‘must take’ vitamin list for everyone on Mounjaro or Wegovy. Avoid stacking weight-loss supplements, stimulant products, laxatives, diuretics or appetite-suppressant products with prescription treatment unless your clinician has checked them. Supplements can still affect blood pressure, blood sugar, bleeding risk, digestion or other medicines, even when they are sold as natural. Take the actual supplement labels to your pharmacist or prescriber.
Can you drink alcohol with Mounjaro or Wegovy?
Alcohol is not usually treated as a direct drug-drug interaction, but it can make treatment harder to tolerate. It may worsen nausea, vomiting, reflux, dehydration and poor food intake. Alcohol can also make low blood sugar more likely or harder to recognise in people with diabetes, especially if meals are missed. [5][6]
When to monitor, contact your prescriber, or seek urgent help
Interaction advice is only useful if it tells you what to do next. Use this as a safety guide, not as a substitute for individual medical advice.
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Route
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Use this route for
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Action
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Monitor / self-manage
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Mild nausea, temporary appetite reduction, mild constipation, mild digestive discomfort that is improving.
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Keep hydrated, eat smaller meals if advised, avoid alcohol if it worsens symptoms, and keep a note of timing and severity. Do not assume symptoms are harmless if they worsen.
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Contact your prescriber / clinician
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Repeated vomiting, diarrhoea, dizziness, faintness, blood sugar changes, missed oral medicine doses, trouble keeping antibiotics down, new symptoms after a dose increase, possible contraceptive risk, or concerns with warfarin/digoxin/insulin/sulfonylureas.
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Ask whether medicine timing, blood tests, blood glucose monitoring, contraception, diabetes medicine dose, blood pressure medicine or treatment dose needs review.
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Seek urgent medical help
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Severe or persistent abdominal pain, signs of pancreatitis, severe dehydration, severe allergic reaction, severe low blood sugar, sudden vision loss or rapidly worsening eyesight.
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Use NHS 111, urgent medical care, 999 or A&E depending on severity. Do not wait for a routine medication review if symptoms are severe or rapidly worsening. [4][5][6][7][8]
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Seek urgent medical help if you develop severe or persistent abdominal pain, signs of severe dehydration, symptoms of a severe allergic reaction, severe low blood sugar, or sudden/rapidly worsening eyesight. If symptoms are severe, rapidly worsening, or involve breathing difficulty, collapse, confusion or unconsciousness, call 999 or go to A&E.
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Symptom or sign
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Why it matters
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What to do
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Severe, persistent pain in the stomach or upper abdomen, especially with nausea, vomiting, fever or pain spreading to the back.
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Could be pancreatitis or another urgent abdominal condition.
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Get urgent medical help. Call 111 for urgent advice, or call 999/go to A&E if symptoms are severe or you have breathing difficulty, fast heartbeat, severe bloating or signs of collapse. [2][4][7]
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Swelling of the lips, tongue, throat or face; breathing difficulty; wheezing; throat tightness; fainting; severe dizziness; fast heartbeat with allergic symptoms.
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Could be anaphylaxis or angioedema, which can be life-threatening.
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Call 999 immediately. Use an adrenaline auto-injector if prescribed. [2][8]
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Unable to keep fluids down, very dark urine or peeing less than normal, dizziness that does not settle, fast heartbeat, unusual drowsiness or confusion.
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Could be dehydration, which is more concerning if you have diabetes, kidney disease, take diuretics or have persistent vomiting/diarrhoea.
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Contact NHS 111 or urgent care. Call 999/go to A&E if there is confusion, difficulty breathing, very cold skin, or the person is difficult to wake. [2][4][6]
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Low blood sugar symptoms such as sweating, shaking, hunger, dizziness, fast heartbeat, blurred vision or confusion; severe hypo with seizure, unconsciousness or not responding normally.
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Can happen when treatment is combined with insulin or sulfonylureas, and can impair driving or decision-making.
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Follow your diabetes team’s hypo plan. NHS advice is to treat blood sugar below 4 mmol/L promptly. Call 999 if someone is unconscious, not responding normally, has no glucagon available, has not recovered after glucagon, or has been drinking alcohol. [2][4][5]
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Sudden loss of vision or rapidly worsening eyesight while using semaglutide.
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Wegovy PIL warns that this may be caused by a very rare eye side effect and needs urgent medical assessment.
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Urgently contact your doctor for ophthalmology assessment; use urgent services if advised or symptoms are severe. [4]
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What to tell your prescriber or pharmacist before starting
Before starting Mounjaro or Wegovy, or before switching between them, prepare a complete medication list. Include prescribed medicines, over-the-counter medicines, vitamins, herbal products, weight-loss supplements, contraceptives, injected medicines, and medicines you only use occasionally.
- List diabetes medicines separately, especially insulin, gliclazide, glimepiride or other sulfonylureas.
- Mention warfarin, acenocoumarol, digoxin, lithium, anti-seizure medicines or any medicine where regular blood tests are used to keep the dose safe.
- Mention the contraceptive pill, contraceptive patch, vaginal ring, implant, injection, coil or any pregnancy plans.
- Mention ramipril, lisinopril, losartan, diuretics or other blood pressure or kidney-related medicines.
- Mention regular aspirin, clopidogrel, anticoagulants, ibuprofen, naproxen or stomach-protection medicines.
- Tell them if you have gastroparesis, pancreatitis history, gallbladder disease, kidney disease, diabetic retinopathy, severe reflux, eating disorder history, or are due for surgery or sedation.
