What Is Atropine? Uses, Dosage, and What You Need to Know in 2026

Atropine Is an Anticholinergic Medication That Blocks Acetylcholine to Increase Heart Rate, Dilate Pupils, and Reduce Body Secretions

Atropine (also known as Atropine Sulfate) is one of the oldest and most widely used medications in modern medicine. Originally derived from the belladonna plant, it's now a staple in emergency rooms, operating rooms, and eye clinics worldwide. If your doctor has prescribed Atropine or you've heard the name during a hospital visit, here's everything you need to know.

What Is Atropine?

Atropine Sulfate is a prescription anticholinergic (antimuscarinic) medication. It works by blocking the effects of acetylcholine, a chemical messenger in your nervous system that controls many automatic body functions.

Key facts about Atropine:

• Generic name: Atropine Sulfate
• Brand names: AtroPen (auto-injector), Isopto Atropine (eye drops), Sal-Tropine (oral — discontinued/rare)
• Drug class: Anticholinergic / Antimuscarinic Agent
• Manufacturers: Multiple — including Pfizer (Hospira), Fresenius Kabi, Hikma, Medefil, and Bausch + Lomb (ophthalmic)
• Controlled substance: No (Atropine by itself is not a controlled substance. However, the combination product Diphenoxylate/Atropine, sold as Lomotil, is Schedule V)
• Generic available: Yes

What Is Atropine Used For?

FDA-Approved Uses

• Symptomatic bradycardia — when your heart rate is dangerously slow and causing symptoms
• Organophosphate and nerve agent poisoning — Atropine is a first-line antidote for poisoning from pesticides and chemical weapons
• Preoperative secretion reduction — given before surgery to reduce saliva and airway secretions
• Eye exams — Atropine eye drops dilate the pupil (mydriasis) and temporarily paralyze focusing (cycloplegia) for thorough eye examinations
• Amblyopia treatment — used in children to blur the stronger eye, forcing the weaker eye to work harder

Off-Label Uses

• Myopia control in children — low-dose Atropine eye drops (0.01%–0.05%) are increasingly prescribed to slow nearsightedness progression
• Death rattle in palliative care — to reduce noisy breathing secretions at end of life
• Pretreatment before intubation — to prevent bradycardia during rapid sequence intubation
• Gastrointestinal antispasmodic — to reduce gut cramping and spasms

How Is Atropine Taken?

Atropine comes in several forms, and the one you receive depends on what it's being used for:

• Injectable solution (0.05 mg/mL to 1 mg/mL) — given by IV, intramuscular, or subcutaneous injection in hospitals and clinics
• AtroPen auto-injector (0.25 mg, 0.5 mg, 1 mg, 2 mg) — designed for emergency self-injection during nerve agent exposure
• Ophthalmic solution (0.5% and 1%) — eye drops instilled by a healthcare provider or at home as directed
• Ophthalmic ointment (1%) — applied to the eye
• Low-dose ophthalmic drops (0.01%–0.05%) — compounded by specialty pharmacies for myopia control

Typical Dosing

• Bradycardia: 0.5–1 mg IV, may repeat every 3–5 minutes up to a maximum of 3 mg
• Organophosphate poisoning: 2–3 mg initially (much higher doses may be needed)
• Eye drops: 1–2 drops of 1% solution as directed by your eye doctor

You should never adjust your Atropine dose without talking to your doctor. For more on how this medication works in your body, see our guide on how Atropine works.

Who Should Not Take Atropine?

Atropine is not safe for everyone. You should not use Atropine if you have:

• Known allergy to Atropine or belladonna alkaloids
• Narrow-angle (angle-closure) glaucoma
• Obstructive urinary problems
• Obstructive gastrointestinal disease or paralytic ileus
• Severe ulcerative colitis or toxic megacolon
• Myasthenia gravis (relative contraindication)
• Unstable cardiovascular status in acute hemorrhage

Atropine is also ineffective in patients who have had a heart transplant, because the transplanted heart lacks the nerve connections Atropine acts on.

Use with caution in elderly patients, children, and pregnant or nursing women. Tell your doctor about all your medical conditions and all medications you take before starting Atropine.

How Much Does Atropine Cost?

Atropine cost varies widely depending on the formulation:

• Ophthalmic solution 1% (5 mL): $20–$54 retail, as low as $20–$27 with a discount coupon
• Injectable solution (vials): $37–$318+ depending on concentration and volume
• AtroPen auto-injectors: $300–$800+ per unit

Generic Atropine eye drops are relatively affordable. Most insurance plans cover Atropine without prior authorization for standard formulations. AtroPen auto-injectors may require prior authorization due to their high cost.

For tips on reducing your out-of-pocket costs, read our guide on how to save money on Atropine.

Final Thoughts

Atropine is a versatile, essential medication used across many areas of medicine — from emergency cardiac care to children's eye health. It's widely available as a generic, making it affordable for most patients. However, certain injectable formulations are experiencing shortages in 2026.

If you need help finding Atropine at a pharmacy near you, use Medfinder to check real-time stock availability. And always talk to your healthcare provider if you have questions about whether Atropine is right for you.