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Someone posted about having severe, frightening symptoms a few days after getting injections of Wegovy (and said the same happens with Mounjaro). They describe intense back pain, chills, muscle aches, heavy painful legs, and that over-the-counter painkillers like aspirin, paracetamol (Dafalgan) or ibuprofen (Irfen) don’t help. The episodes last about five to six hours and are bad enough to interfere with childcare and work. The post is asking if others have had similar reactions. Wegovy is the brand name for a drug whose active ingredient is semaglutide. Semaglutide is a synthetic version of a hormone your gut makes after eating that helps signal fullness to the brain and slows how quickly the stomach empties. Mounjaro is a different drug (tirzepatide) that acts on similar appetite and blood-sugar pathways but is not the same molecule. Both are used for weight management and, in related forms, for diabetes. They are given by injection under the skin, usually once a week. What we can say about these symptoms from this short post: this is an individual report, not a clinical trial. Clinical studies of semaglutide and tirzepatide list common side effects such as nausea, vomiting, diarrhea, constipation, stomach pain, headache, and fatigue. Body aches, chills or intense, short episodes of muscle pain and severe back pain are less commonly emphasized but are reported anecdotally by some patients. Because this message is a single-person account, we can’t know how often it happens overall, whether the shots caused it directly, or whether another illness was involved. Larger studies and official safety reports give a clearer picture of typical side effects, but rare or idiosyncratic reactions can appear only after many people start using a drug. Why it matters: if you or someone you care for is thinking about starting Wegovy or Mounjaro, it’s important to know that while many people tolerate these medications fairly well, some experience side effects that can be intense enough to disrupt daily life. Parents, people with physically demanding jobs, or anyone who can’t afford periods of debility should factor that possibility into their decision. It also matters for clinicians who need to distinguish expected side effects from signs of other problems, and for regulators keeping track of safety as more people use these drugs. Caveats and risks: this post doesn’t prove the drug caused the symptoms, and we don’t know the person’s medical history, other medications, or whether they had an infection. Serious allergic reactions to semaglutide or tirzepatide are rare but possible and would require immediate medical care. Commonly recommended steps are to report the event to your prescribing clinician, consider pausing the medication until a doctor evaluates you, and report side effects to your country’s drug-safety authority so they can track patterns. If symptoms are severe, sudden, or include trouble breathing, chest pain, fainting, or signs of infection (high fever, persistent worsening), seek emergency care. Bottom line: this is a worrying personal report of severe, short-lived pain and chills after a weekly injection; it’s worth taking seriously, but one message doesn’t prove a general risk — discuss it with your doctor and report it so clinicians and regulators can learn more.
Source: r/Semaglutide