| What Are The Side Effects Of Metandienone? Side Effects of Metandienone (Methandrostenolone) The information below is derived from peer‑reviewed pharmacology and toxicology literature, as well as clinical case reports. Symptom Frequency / Notes Typical Onset Common Duration
Gastrointestinal upset (nausea, vomiting, abdominal pain) 20–40 % of users Within hours of ingestion 24–48 h; resolves with dose reduction or cessation
Acne / oily
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