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Someone who uses peptide products regularly says they reconstituted a new vial of "Tirz" (presumably tirzepatide, a weight-loss/diabetes drug sold under brand names like Mounjaro) from a kit bought through a group buy, injected their usual dose, and then developed a fever lasting about six days. They say they've never had problems before, that they store and handle products carefully, and that this reaction came after using this new vial. Tirzepatide is a relatively new medicine that acts like two gut hormones to reduce appetite and help control blood sugar. In plain terms, it tells your brain you’re less hungry and can slow digestion a bit. It’s a prescription drug, usually given as a weekly injection, and is approved for treating type 2 diabetes and, in some places, for weight management. It is not a harmless vitamin; it’s a potent, regulated medication with known side effects. From this single report we can’t claim a definitive cause. It’s an anecdote: one person, one new vial, and a fever that lasted several days. That could be from a range of things — an infection introduced during injection, a contaminated vial or bad reconstitution (mixing the medicine with the wrong liquid or unclean equipment), an immune reaction to the drug, or just an unrelated viral illness that happened to start then. Clinical trials and prescribing information for tirzepatide list common side effects like nausea, diarrhea, or injection-site reactions, but prolonged fever is not a widely reported typical side effect. So the evidence here is a single-user report, not a controlled study. Why this matters: people buying peptides through group buys or outside normal pharmacy channels are at greater risk of getting products of uncertain quality or handling. If a vial is contaminated or was stored improperly, it can cause infections or other adverse reactions. Anyone self-administering prescription peptides should know that an unusual fever after injection is a signal to seek medical attention. Health professionals can check for infection, allergic reaction, or other causes and can report problems to regulators or manufacturers to help track safety issues. Caveats and risks: this post doesn’t prove tirzepatide causes six-day fevers. It also doesn’t tell us the exact product identity, whether the person followed sterile technique perfectly, or if they had any other exposures. Buying prescription medicines through unofficial channels bypasses safeguards — storage, cold chain, sterility, and authenticity can all be compromised. If you’re using these drugs, use legitimate prescriptions and pharmacies, follow sterile injection practices, and call a doctor for fevers, severe symptoms, or signs of infection (redness, swelling, pus, high fever). Regulatory status: tirzepatide is prescription-only; self-sourcing and DIY reconstitution increases risk. Bottom line: a single report of a long fever after using a new vial is concerning but not proof the drug caused it — seek medical care and be cautious about where and how you obtain injectable peptides.
Source: r/Peptides