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

Rivastigmine is an effective treatment for dementia, but like all medications, it comes with potential side effects. Understanding what to expect — and knowing which side effects are minor versus serious — can help patients and caregivers feel more confident and prepared. Here's a comprehensive guide to rivastigmine side effects, organized by frequency and severity.

The Most Common Side Effect: GI Upset

The most frequently reported side effects of rivastigmine affect the gastrointestinal tract. These occur because rivastigmine increases acetylcholine activity throughout the body — not just the brain — which stimulates gut motility and secretion.

Common GI side effects include:

Nausea (most common — affects many patients, especially during dose increases)

Vomiting

Diarrhea

Loss of appetite and reduced food intake

Weight loss (can be significant if vomiting or loss of appetite continues)

Stomach pain or cramping

These side effects are most likely to occur during the titration phase (when your dose is being increased). They are less common during stable maintenance dosing. Taking rivastigmine capsules with food significantly reduces the likelihood of GI side effects.

Why the Patch Has Fewer GI Side Effects

The transdermal patch delivers rivastigmine slowly and continuously through the skin, avoiding the rapid peaks in blood levels that cause GI irritation with the oral capsule. Clinical trials showed the 9.5 mg/24h patch produced one-third fewer reports of nausea and vomiting compared to the highest oral dose, while providing similar cognitive benefits. If GI side effects are significant on the capsule, ask your doctor about switching to the patch.

Other Common Side Effects

Dizziness and fatigue: Can affect balance — use caution when standing up quickly.

Headache: Usually mild and resolves as the body adjusts.

Muscle cramps and weakness: Less common; more likely with higher doses.

Sleep disturbances: Including vivid dreams and insomnia; more common with nighttime dosing of oral forms.

Application site reactions (patch): Redness, itching, or mild irritation under the patch. Rotate the application site daily to reduce this.

Serious Side Effects — Call Your Doctor Right Away

While less common, some rivastigmine side effects require prompt medical attention:

Severe or persistent vomiting/diarrhea: Can lead to dangerous dehydration. Call your doctor if you cannot keep fluids down.

GI bleeding: Black or tarry stools, blood in vomit, or severe stomach pain. Seek emergency care immediately.

Slow or irregular heartbeat: Chest pain, fainting, or feeling your heart beating abnormally slowly. Call 911.

Seizures: Unusual movements, loss of consciousness, or muscle jerking. Seek emergency care.

Allergic contact dermatitis (patch): Spreading rash beyond the patch site, blistering, or severe skin reaction. Remove the patch and contact your doctor. In rare cases, Stevens-Johnson syndrome has been reported.

Worsening tremors or movement problems: Particularly in Parkinson's patients. Rivastigmine can sometimes worsen extrapyramidal symptoms.

Signs of Overdose — Call 911 or Poison Control (1-800-222-1222)

Using too many patches at once or taking more capsules than prescribed can cause a cholinergic crisis — a medical emergency. Signs include: severe nausea and vomiting, profuse sweating, excessive salivation, slow heart rate, weak or shallow breathing, seizures, and loss of consciousness. This is more common with accidental double-patching.

Tips to Minimize Side Effects

Always take oral rivastigmine with food (not on an empty stomach)

Follow the titration schedule — don't increase doses faster than prescribed

Rotate the patch site daily (never apply in the same spot two days in a row)

If GI side effects are severe, ask your doctor about switching to the patch formulation

Report new symptoms promptly — some side effects improve with dose adjustment

Related Resources

Some side effects can be worsened by drug interactions. See our guide on rivastigmine drug interactions to learn which medications to avoid. If you're having trouble finding your rivastigmine, medfinder can help you locate it at a nearby pharmacy.