Weight Loss
Wegovy Pill Interactions With Other Medicines
In one sentence
The Wegovy pill can interact with a few medicines, most importantly insulin and sulfonylureas, levothyroxine and warfarin, and because it slows digestion, timing matters, so always tell your prescriber everything you take.
At a glance
The Wegovy pill slows digestion, which can affect how other oral medicines are absorbed.
The 30-minute wait after your tablet keeps other oral medicines separate.
With insulin or sulfonylureas, doses may be lowered to avoid low blood sugar.
It can raise thyroid hormone levels, so thyroid medicine may need monitoring.
Your INR is monitored more closely at first if you take warfarin.
It does not reduce the contraceptive pill, and no extra protection is needed.
It should not be taken with another GLP-1 medicine.
Most people can take the Wegovy pill alongside their usual medicines with only a few simple adjustments. A handful of interactions are worth knowing about, and the good news is that almost all of them are easily managed once your prescriber knows your full medicines list.
Key takeaways
Does it affect the contraceptive pill?
No. There is no clinically relevant interaction, and you do not need extra contraception.
What are the main interactions?
Insulin and sulfonylureas, levothyroxine, warfarin, and other GLP-1 medicines.
Why does timing matter?
It slows digestion, so wait at least 30 minutes before taking other oral medicines.
What should you do?
Tell your prescriber every medicine and supplement you take, so any changes can be made safely.
Does the Wegovy pill interact with other medicines?
Yes, with a few. Because oral semaglutide slows how quickly your stomach empties, it can influence how other oral medicines are absorbed.1 The main interactions to be aware of are summarised below.
Medicine | What can happen | What is usually done |
Insulin or sulfonylureas (diabetes) | Higher risk of low blood sugar | Doses may be lowered and blood sugar watched |
Levothyroxine (thyroid) | Thyroid hormone levels can rise | Thyroid function is monitored |
Warfarin and similar blood thinners | Anticoagulation may shift when starting | INR is checked more often at first |
Other GLP-1 medicines (such as Mounjaro or Ozempic) | Not recommended together | Do not combine |
Other oral tablets | Absorption can be affected by timing | Wait at least 30 minutes after the Wegovy pill |
The contraceptive pill | No clinically relevant effect | No extra precautions needed |
"The single most useful thing you can do is tell us every medicine and supplement you take, including anything from the supermarket. Most interactions are simple to manage once we know about them. It is the ones we do not know about that can cause problems."
Does the Wegovy pill affect the contraceptive pill?
No. Studies show no clinically relevant effect of oral semaglutide on the contraceptive pill (containing ethinylestradiol and levonorgestrel), so you do not need to use extra contraception.1 This is an important difference from some weight-loss injections such as Mounjaro (tirzepatide), which can reduce how well the pill works and does require backup contraception. See our comparison of the Wegovy pill and Mounjaro.
"This is a common worry, so let me be clear: the Wegovy pill does not reduce the effectiveness of the contraceptive pill, and you do not need extra protection. That is different from some weight-loss injections, which is exactly why checking the specific medicine matters."
The Wegovy pill and diabetes medicines
If you take insulin or a sulfonylurea for type 2 diabetes, your prescriber may reduce those doses when you start the Wegovy pill, because together they can increase the risk of low blood sugar (hypoglycaemia).1 Diabetes UK notes the same point about combining semaglutide with these medicines.2 Learn more about who can take the Wegovy pill.
The Wegovy pill and thyroid medicine (levothyroxine)
The Wegovy pill can raise the level of thyroid hormone in your body when taken with levothyroxine, so your prescriber may check your thyroid function and adjust your dose if needed.1 Remember to take your levothyroxine after the 30-minute wait, not at the same time as the Wegovy pill.
The Wegovy pill and warfarin or blood thinners
If you take warfarin or a similar blood thinner, your INR (a measure of how quickly your blood clots) is checked more often when you first start the Wegovy pill, so your dose can be kept in the right range.1
Can you take other tablets at the same time as the Wegovy pill?
No. Take the Wegovy pill on its own, then wait at least 30 minutes before taking any other oral medicines. This is because it needs an empty stomach to be absorbed, and taking other tablets too soon can affect how either medicine works.1 Everyday painkillers such as paracetamol are fine to take after the 30-minute gap. See how to take the Wegovy pill correctly.
"In practice, your other morning tablets simply move to after the 30-minute wait. For medicines like levothyroxine or warfarin we may add a check or two at the start, but it is all routine and easily arranged. None of this should put you off treatment."
Can you take the Wegovy pill with other weight-loss medicines?
You should not take the Wegovy pill with another GLP-1 receptor agonist, such as the Wegovy injection, Ozempic or Mounjaro.1 Only one of these medicines should be used at a time. Your prescriber will confirm the right single treatment for you through an online weight-loss consultation.
Related Wegovy pill guides
Frequently asked questions about Wegovy pill interactions
Does the Wegovy pill affect the contraceptive pill?
No. There is no clinically relevant interaction between oral semaglutide and the contraceptive pill, so you do not need extra contraception. This differs from some weight-loss injections such as Mounjaro, which can reduce how well the pill works.
Can you take the Wegovy pill with insulin?
Often yes, but with care. Insulin and the Wegovy pill together can increase the risk of low blood sugar, so your prescriber may lower your insulin dose and ask you to monitor your levels. Always share your full diabetes treatment.
Can you take levothyroxine with the Wegovy pill?
Yes, but your thyroid function may be monitored, as the Wegovy pill can raise thyroid hormone levels. Take your levothyroxine after the 30-minute wait, not at the same time as the Wegovy pill.
Can you take painkillers with the Wegovy pill?
Yes. Everyday painkillers such as paracetamol can be taken, but wait at least 30 minutes after your Wegovy pill, as you would with any other oral medicine. If you take regular prescription painkillers, tell your prescriber.
Can you take the Wegovy pill with other tablets?
Yes, but not at the same time. Take the Wegovy pill first on an empty stomach, then wait at least 30 minutes before taking any other oral medicines, so absorption is not affected.
Can you take the Wegovy pill with Mounjaro?
No. You should not take two GLP-1 type medicines together. The Wegovy pill and Mounjaro should not be combined, and only one weight-loss medicine should be used at a time. Your prescriber will confirm the right single option for you.
Sources and references
electronic medicines compendium (emc). Wegovy tablets: Summary of Product Characteristics. Section 4.5 reports no clinically relevant effect on oral contraceptives, a 33% increase in thyroxine exposure with levothyroxine (monitor thyroid), INR monitoring on starting warfarin, dose reduction of insulin or sulfonylureas to avoid hypoglycaemia, delayed gastric emptying affecting oral medicines, and not combining with other GLP-1 receptor agonists.
Diabetes UK. Wegovy (semaglutide). Notes that low blood sugar is more likely when semaglutide is taken with insulin or a sulfonylurea.
Medical disclaimer: This article is for general information and does not replace advice from a qualified healthcare professional. It does not list every possible interaction. Always tell your prescriber and pharmacist about all the medicines and supplements you take, and read the patient information leaflet. If you have questions about your health, contact your GP or call NHS 111.
Our commitment to accuracy: This page reflects the approved product information and current UK guidance from sources such as the emc, NHS, NICE and the MHRA. It is reviewed by our Superintendent Pharmacist and updated as guidance changes.
About the author
Blog author
Dayna Sheppard
Dayna is a pharmacy manager with over 15 years of pharmacy experience. She is focused on delivering a safe and excellent pharmacy service for patients.
Medically reviewed by
Medical reviewer
Taslima Hussain
Taslima is a pharmacist who is passionate about patient care. She has experience working in community pharmacy as a locum.
