Scopolamine Side Effects: What to Expect and When to Call Your Doctor

Scopolamine transdermal patches are effective for motion sickness and postoperative nausea, but like all medications, they come with potential side effects. Most are mild and related to the drug's anticholinergic mechanism. A few are serious enough to warrant immediate patch removal and medical attention. This guide covers everything you need to know before putting on your first scopolamine patch.

How Scopolamine Causes Side Effects

Scopolamine works by blocking acetylcholine receptors throughout the body — not just in the brain regions responsible for nausea. This broad anticholinergic effect is what causes most of the drug's side effects. Wherever acetylcholine normally has an effect in the body — saliva production, tear production, bladder function, gut motility, heart rate, and sweating — scopolamine can disrupt it.

Common Side Effects (Most Patients Will Experience These)

Dry mouth: The most common side effect. Acetylcholine normally stimulates saliva production; when it's blocked, your mouth becomes dry. Sugarless gum, ice chips, or saliva substitutes can help.

Drowsiness/sedation: Scopolamine crosses the blood-brain barrier and has a calming, sedating effect on the CNS. This can impair driving and operating machinery — do not drive until you know how the patch affects you.

Dizziness: Some patients feel lightheaded or dizzy, particularly in the first hours after applying the patch.

Blurred vision / dilated pupils: One of the more notable effects. If you accidentally touch the patch and then rub your eye, the scopolamine can cause pupil dilation (mydriasis) and blurred vision. This is why thorough handwashing after handling the patch is essential. The same effect can occur through normal drug absorption — it usually resolves after patch removal.

Skin irritation at application site: Redness, itching, or mild irritation at the site behind the ear is common and generally resolves after removing the patch.

Dry skin and decreased sweating: Reduced sweating is an anticholinergic effect. While mild, this becomes dangerous in hot environments (see the June 2025 FDA warning below).

Serious Side Effects: Remove the Patch and Call Your Doctor

Hyperthermia (dangerous body temperature elevation): The FDA issued a Drug Safety Communication in June 2025 warning about hyperthermia with scopolamine patches. Cases of hospitalization and death were reported, predominantly in children under 17 and adults over 60. Remove the patch immediately if you feel unusually hot or stop sweating in a warm environment, and seek medical care. Note: symptoms can persist after patch removal because scopolamine lingers in skin layers.

Hallucinations and psychotic-like behavior: Seeing, hearing, or perceiving things that are not there; delusions; disorganized thinking. Remove the patch and contact your provider immediately. These effects are more common in elderly patients and those with psychiatric histories.

Acute angle-closure glaucoma: Scopolamine's pupil-dilating effect can block fluid drainage from the eye, causing a sudden increase in eye pressure. Symptoms: severe eye pain, blurred vision, halos around lights, eye redness. This is a medical emergency — remove the patch and go to an emergency room.

Urinary retention: Difficulty urinating or inability to empty the bladder. Most common in men with an enlarged prostate. Remove the patch and contact your doctor.

Seizures: Reported in some patients; more significant risk in those with a seizure history or severe preeclampsia in pregnant women. Remove the patch and call 911.

Severe allergic reaction: Swelling of face, lips, tongue or throat; difficulty breathing; severe rash. Remove the patch and call 911 immediately.

Withdrawal Symptoms After Removing the Patch

If you've worn scopolamine patches for several days or longer, you may experience withdrawal symptoms when the patch is removed. These typically begin 24 hours or more after removal and can include:

Nausea and vomiting (the very symptoms the patch was preventing)

Dizziness or balance disturbances

Headache, sweating, abdominal cramps

Mental confusion, muscle weakness

Slow heart rate (bradycardia) or low blood pressure

Withdrawal symptoms can be severe in some cases. If symptoms are severe, contact your healthcare provider — they may recommend supportive treatment or a gradual tapering approach if the patch has been worn continuously for an extended period.

Special Populations at Higher Risk

Children under 17: Higher risk of hyperthermia, hallucinations, confusion, and dizziness. Safety and efficacy in pediatric patients have not been established — discuss carefully with a pediatrician.

Adults over 60: Higher risk of confusion, hallucinations, hyperthermia, and withdrawal. Some guidelines recommend against routine scopolamine use in the elderly due to the risk of delirium.

Pregnant women: Scopolamine may cause seizures in women with severe preeclampsia. Do not use without physician oversight during pregnancy.

Practical Tips to Minimize Side Effects

Always wash your hands thoroughly after applying or handling the patch.

Avoid touching your eyes after handling the patch.

Avoid hot environments, heating pads, or electric blankets while wearing the patch.

Do not drive until you know how the patch affects you.

Tell your MRI technician you are wearing the patch (it contains aluminum and must be removed before scanning).

Limit or avoid alcohol while wearing the patch — it worsens drowsiness, dizziness, and confusion.

For more information on medications that can worsen scopolamine's side effects, read: Scopolamine Drug Interactions: What to Avoid and What to Tell Your Doctor

If you've had your prescription filled and are wondering how to find scopolamine patches in stock near you, medfinder.com can help.