Side Effects
Common side effects of atropine include dry mouth, blurred vision, photophobia, tachycardia, flushed skin, constipation, difficulty with urination, inability to perspire appropriately, delirium or coma (McLendon & Preuss, 2021).
Precautions (Pfizer, 2020)
Atropine may cause adverse effects in patients with the following conditions:
- Known hypersensitivity
- Tachycardia
- Suspected glaucoma: atropine may precipitate acute glaucoma
- Pyloric stenosis: atropine may cause complete obstruction
- Prostatic hypertrophy: atropine may cause urinary retention in these patients
Atropine should be used with caution in patients with fever and in patients with thyrotoxicosis, cardiac insufficiency, and in cardiac surgery where it may further increase the heart rate.
Drug-Drug Interactions (Pfizer, 2020)
The action of atropine may be enhanced by tricyclic antidepressants, monoamine oxidase inhibitors (MAOI’s), phenothiazine, amantadine, some antihistamines, butyrophenones, and disopyramide.
Overdose (Pfizer, 2020)
The following symptoms could signal overdose: palpitations, dilated pupils, difficulty swallowing, hot dry skin, thirst, dizziness, restlessness, tremor, fatigue, and ataxia. Toxic doses can cause palpitations, restlessness, hallucinations, delirium, and coma. Severe overdose may result in circulatory collapse, respiratory failure, paralysis, and coma. Treatment of toxic overdose include a short-acting barbiturate or diazepam to treat excitement and convulsions. Physostigmine (1 to 4 mg) is an atropine antidote administered by slow IV injection. Repeat doses may be required.