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Someone who was taking Mounjaro (a prescription weight-loss and diabetes drug) posted that after stopping it they felt lightheaded and then fainted for the first time in their life. They started the drug last August, peaked at 10 mg, lowered to 5 mg, and stopped the 5 mg dose on May 16. Eighteen days later they had a CT scan with contrast and that night they had low blood pressure and passed out. They’re asking if others have had the same thing after stopping Mounjaro. Mounjaro is the brand name for tirzepatide. It’s a man-made medicine that copies two natural gut hormones that help control blood sugar and reduce appetite. In plain terms: it tells your body to release insulin when needed and also dials down hunger and food intake. People take it for type 2 diabetes and, increasingly, off-label for weight loss. It’s given as a once-weekly injection and can change how your appetite, digestion, and blood-sugar responses behave while you’re on it. What we actually know about “withdrawal” or fainting after stopping Mounjaro is limited. Most of the clinical trial data focus on benefits while people are taking the drug, and common side effects during treatment include nausea, diarrhea, and low blood sugar if you’re also on insulin or sulfonylureas. There isn’t strong, published evidence that stopping tirzepatide causes a predictable withdrawal syndrome that includes fainting. The single post you’re reading is an anecdote — one person’s story — and it can’t prove cause and effect. Other things could explain fainting: the CT contrast, dehydration, changes in other meds, low blood sugar, or an unrelated medical condition. Why this matters: if someone is stopping Mounjaro, they and their clinicians should watch for changes in appetite, blood sugar, and how they feel overall. People with diabetes might be most affected because the drug affects insulin and blood-sugar control; stopping it can change how much insulin your body needs or how you respond to food. Anyone who experiences dizziness, lightheadedness, fainting, or very low blood sugar after a dose change should seek medical attention and check their blood sugar and blood pressure. It’s also worth telling your imaging team and doctors about recent medication changes if you’re having tests with contrast or other procedures. Caveats and risks: we don’t have proof that stopping Mounjaro causes low blood pressure or fainting. The internet post doesn’t give full medical details — for example, whether the person was on other medications, had low blood sugar, or had an underlying heart issue. Contrast injections for CT scans can rarely cause reactions, and dehydration or skipped meals also raise fainting risk. If you’re thinking of starting, changing, or stopping tirzepatide, talk to the clinician who prescribed it. Don’t stop it abruptly without medical advice, especially if you have diabetes or take other drugs that affect blood sugar or blood pressure. Bottom line: a single report of fainting after stopping Mounjaro is worth asking about with a doctor, but it doesn’t prove the drug caused the fainting.
Source: r/Mounjaro