Wegovy (semaglutide) has relatively few absolute drug interactions, but several categories of medication require dose adjustments or closer monitoring when combined with it. The most important are other GLP-1 drugs, insulin, and medications that lower blood sugar. Beyond those, Wegovy slows stomach emptying, which can change how your body absorbs certain pills.
Other GLP-1 Medications
You should not take Wegovy alongside another GLP-1 receptor agonist or any other semaglutide-containing product. That means you cannot combine Wegovy with Ozempic (also semaglutide), Mounjaro or Zepbound (tirzepatide), Saxenda (liraglutide), or any similar drug in this class. These medications all work through overlapping pathways, and stacking them increases the risk of serious side effects like severe nausea, vomiting, and dangerously low blood sugar. The recommended maximum for this drug class is one at a time.
Insulin and Sulfonylureas
Wegovy lowers blood sugar on its own. If you’re also taking insulin or a sulfonylurea (a common type of diabetes pill that stimulates your pancreas to release more insulin), the combination can push your blood sugar dangerously low. Symptoms of hypoglycemia include shakiness, dizziness, confusion, sweating, and in severe cases, loss of consciousness.
The FDA labeling specifically states that when starting Wegovy, your prescriber should consider reducing the dose of insulin or sulfonylureas to prevent this. If you take either of these medications and are prescribed Wegovy, your doctor will likely lower your diabetes medication dose at the start and monitor your blood sugar more frequently as you adjust. This applies to adults and to adolescents 12 and older with type 2 diabetes.
Oral Medications and Stomach Emptying
Wegovy slows how quickly food and medication move from your stomach into your intestines. This delay in gastric emptying has the potential to change how much of an oral medication gets absorbed and how quickly it reaches peak levels in your blood. In clinical testing, semaglutide did not cause clinically significant changes for most drugs studied, including warfarin, the blood pressure drug lisinopril, and the heart medication digoxin.
However, some medications did show measurable changes. Levothyroxine (thyroid hormone replacement) showed a 33% increase in total absorption. Metformin showed a 32% increase. The cholesterol drug rosuvastatin saw a 41% increase in total absorption and a small bump in peak blood levels. The diuretic furosemide had a 28% increase in total absorption but a 34% drop in its peak concentration, meaning it gets absorbed more slowly.
For most people, these shifts don’t require a dose change. But if you take a medication where precise dosing matters, particularly levothyroxine or a narrow-therapeutic-index drug, your doctor may want to check your levels after you start Wegovy to make sure you’re still in the right range.
Oral Birth Control Pills
The UK’s medicines regulator (MHRA) has warned that GLP-1 drugs, including Wegovy, could reduce the effectiveness of oral contraceptives. The concern centers on the same delayed stomach emptying that affects other pills. Clinical pharmacology data for semaglutide showed no significant change in the absorption of the hormones ethinylestradiol and levonorgestrel, which are the active ingredients in most combination birth control pills. Still, the MHRA advises that women taking GLP-1 weight loss drugs use a barrier method of contraception (like condoms) if they want to avoid pregnancy. If you rely solely on an oral contraceptive, this is worth discussing with your prescriber.
NSAIDs and Dehydration Risk
Wegovy’s most common side effects are nausea, vomiting, and diarrhea, all of which can leave you dehydrated. If you regularly take NSAIDs like ibuprofen or naproxen, dehydration compounds a known risk: NSAIDs reduce blood flow to the kidneys, and when you’re already low on fluids, this combination can stress kidney function. The risk is especially elevated if you’re also taking a diuretic (water pill) or a blood pressure medication like an ACE inhibitor or ARB. This three-drug combination, sometimes called the “triple whammy,” is associated with a 31% increased rate of acute kidney injury, with the highest risk in the first 30 days.
This doesn’t mean you can never take ibuprofen while on Wegovy. But if you’re experiencing significant GI side effects like vomiting or diarrhea, it’s wise to stay well hydrated and be cautious with NSAIDs during those episodes.
Alcohol
Alcohol isn’t a medication, but it’s worth flagging here because the combination with Wegovy raises the risk of pancreatitis, an inflammation of the pancreas that can be serious. GLP-1 receptor agonists already carry a warning about pancreatitis as a potential side effect. Cleveland Clinic guidance notes that patients with a history of excess alcohol use should stop drinking before starting GLP-1 therapy. Even without a history of heavy drinking, alcohol can also interfere with blood sugar regulation, compounding the hypoglycemia risk if you have diabetes.
Who Should Not Take Wegovy at All
Two groups of people should never use Wegovy regardless of other medications. First, anyone with a personal or family history of medullary thyroid carcinoma (MTC), a specific type of thyroid cancer. Second, anyone with Multiple Endocrine Neoplasia syndrome type 2 (MEN 2), a genetic condition that raises the risk of certain tumors. These are absolute contraindications based on findings from animal studies with semaglutide. If you’ve had a serious allergic reaction to semaglutide or any ingredient in Wegovy, it’s also contraindicated.
Before Surgery
If you’re scheduled for an elective procedure requiring anesthesia, your surgical team needs to know you’re on Wegovy. Because the drug slows stomach emptying, there was initial concern about aspiration risk during anesthesia. Updated 2024 guidance from a multi-society panel including the American Society of Anesthesiologists says most patients can continue their GLP-1 medication before surgery. The exceptions: if you’re still in the dose escalation phase (typically the first four to eight weeks, when GI side effects are strongest), elective surgery should be postponed until that phase is over and symptoms have settled. Higher-risk patients may be asked to follow a liquid diet for 24 hours before the procedure.