| | Description | When It Occurs | |---|---|---| | Nausea & Vomiting | Most common; body adjusting to the drug. | First few days | | Drowsiness / Fatigue | Especially with painkillers, antihistamines, or antidepressants. | Within hours of first dose | | Dizziness | Due to blood pressure changes or inner ear impact. | Standing up quickly | | Headache | Common with vasodilators or SSRIs. | First 1–2 weeks | | Dry Mouth | From anticholinergic drugs. | Throughout treatment | | Rash / Itching | Possible mild allergic reaction. | Days to weeks | | Diarrhea or Constipation | Antibiotics (diarrhea) or opioids (constipation). | Variable |
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