Taking too much Wegovy causes severe nausea, severe vomiting, and potentially dangerous drops in blood sugar. Because semaglutide (the active ingredient in Wegovy) has a half-life of about one week, these symptoms can persist for days, not hours. There is no antidote to flush it from your system faster, so management focuses on treating symptoms as they arise.
The Most Common Overdose Symptoms
The gastrointestinal effects that many Wegovy users experience at normal doses become significantly more intense with an overdose. Severe nausea and vomiting are the hallmark symptoms. This happens because semaglutide slows gastric emptying (how quickly food leaves your stomach) and activates brain centers involved in appetite regulation and nausea. At higher-than-intended doses, both of these effects go into overdrive.
Hypoglycemia, or dangerously low blood sugar, is the other major concern. Semaglutide stimulates insulin release in response to blood sugar levels. Too much of the drug can push blood sugar lower than it should go. The risk of hypoglycemia climbs substantially if you’re also taking other blood sugar-lowering medications like insulin, metformin, or sulfonylureas. Signs of low blood sugar include shakiness, sweating, confusion, dizziness, and rapid heartbeat.
Why Symptoms Last So Long
Most medications clear your body within hours. Semaglutide does not. Its half-life is approximately one week, meaning it takes about seven days for your body to eliminate just half of the dose. After an overdose, this translates to a prolonged window where symptoms can continue or even worsen before they improve. The FDA label specifically notes that “a prolonged period of observation and treatment for these symptoms may be necessary” because of this unusually long duration of action. If you’ve taken too much, you could be dealing with nausea and other effects for several days.
How Overdoses Typically Happen
Most cases of taking too much semaglutide are not intentional. Data from U.S. poison centers shows that the vast majority of reported cases are unintentional therapeutic errors, accounting for roughly 69% to 90% of all reported exposures depending on the study. These errors include injecting the wrong dose, accidentally dosing twice in one week, or confusing the pen’s dosing mechanism. Device-related errors are common with injectable medications in this class. Studies have found first-dose error rates between 17% and 57% for similar injection pens.
Compounded versions of semaglutide (those made by compounding pharmacies rather than the brand-name manufacturer) have been a particular source of dosing errors. The FDA has issued alerts specifically about these products, where concentration differences can lead to patients inadvertently injecting far more than intended.
Serious Complications to Watch For
Beyond nausea and low blood sugar, there are rarer but more serious risks. Severe, persistent vomiting can lead to dehydration, which in turn can strain the kidneys. Staying hydrated during prolonged vomiting episodes is critical.
Pancreatitis is another concern with this drug class. Research published in Cardiovascular Diabetology found a small but measurable increase in acute pancreatitis risk during the first six months of GLP-1 receptor agonist use at standard doses. At excessive doses, the risk could be higher. Symptoms of pancreatitis include intense upper abdominal pain that may radiate to the back, nausea that doesn’t improve, and a swollen or tender abdomen. This is a medical emergency.
What to Do If You’ve Taken Too Much
If you’ve accidentally injected more Wegovy than prescribed, contact Poison Control immediately. You can call 1-800-222-1222 or use the webPOISONCONTROL online tool. Both options are free, confidential, and available 24 hours a day. Poison Control specialists can assess the severity based on how much extra you took and what other medications you’re on, then advise whether you need to go to a hospital or can manage symptoms at home.
Since the drug stays active in your body for days, even if you feel fine immediately after the injection, symptoms may develop later. Monitor yourself for nausea, vomiting, and signs of low blood sugar over the next several days. If you take insulin or other diabetes medications alongside Wegovy, the risk of a dangerous blood sugar drop is higher, and you should be especially vigilant. Keep fast-acting sugar sources (juice, glucose tablets) on hand.
Data from poison centers shows that the proportion of semaglutide overdose cases requiring medical facility care has been increasing, rising from 23% to about 34% as the drug has become more widely used. Most cases still involve mild gastrointestinal symptoms that resolve with supportive care, but the long half-life means you should not assume you’re in the clear just because you feel okay a few hours later.
Skipping Your Next Dose
If you’ve taken a double dose or significantly more than intended, do not take your next scheduled dose without guidance from your prescriber or Poison Control. Because the drug lingers for a week or more, stacking another dose on top of an accidental overdose compounds the problem. Your prescriber can help you figure out when it’s safe to resume your normal dosing schedule based on how much extra you received and how you’re feeling.