The most common side effect of the selegiline transdermal patch is a reaction at the application site, such as redness, itching, or irritation. Other frequently reported effects include dry mouth, headache, trouble sleeping, and gastrointestinal issues like diarrhea or heartburn. While many side effects are mild, it is crucial to monitor for any that are severe or persistent.
Understanding the side effects of the selegiline patch involves differentiating between common, manageable skin reactions and less frequent but more serious systemic effects. Proper application and awareness of warning signs are key to using this medication safely and effectively.

The Most Frequent Side Effect: Application Site Reactions
The vast majority of users will experience some form of skin reaction where the patch is applied. These are typically manageable with proper care.
Redness, Itching, and Irritation
The most common reactions are mild redness, itching, or general irritation. These symptoms often occur as your body adjusts to the medication being delivered through the skin.
Blistering, Burning, or Hardening
In some cases, the skin reaction can be more pronounced, leading to blisters, a burning sensation, or the hardening and thickening of the skin under the patch.
Best Practices for Minimizing Skin Issues
To minimize skin irritation, always rotate the application site with each new patch, which should be changed every 24 hours. Apply the patch to a clean, dry, and smooth area of skin on the upper chest, back, upper thigh, or outer arm. Pressing it firmly ensures it adheres properly and delivers the medication evenly.
Common Systemic Side Effects
Beyond the skin, selegiline can affect other body systems as it is absorbed into the bloodstream.
Gastrointestinal Issues
Users may experience a range of digestive symptoms. These can include diarrhea, heartburn, nausea, constipation, or bloating.
Neurological and Mood-Related Effects
The medication can impact the central nervous system. Common effects are dry mouth, headache, trouble sleeping (insomnia), and a feeling of restlessness.
Changes in Body Weight
The references indicate that both weight loss and weight gain are possible side effects. It is important to monitor your weight and discuss any significant changes with your healthcare provider.
Understanding Serious but Less Common Risks
While most side effects are mild to moderate, you must be aware of more severe potential reactions that require immediate medical attention.
The Risk of Serotonin Syndrome
A serious condition called serotonin syndrome can occur, especially if selegiline is combined with other medications. Symptoms include confusion, hallucinations, and muscle stiffness or tremors.
Cardiovascular Concerns
Selegiline can impact the cardiovascular system. You should seek immediate medical help for symptoms like high blood pressure, severe headache, or chest pain.
Worsening of Pre-existing Conditions
This medication can worsen certain underlying health issues. Patients with a history of bipolar disorder, mania, heart problems, or low blood pressure should use selegiline with extreme caution and under close medical supervision.
When to Seek Immediate Medical Attention
Report any persistent or severe side effects to your doctor. Go to an emergency room or call for help immediately if you experience seizures, suicidal thoughts, or other severe symptoms mentioned above.
Making an Informed Decision
Understanding this information allows you to work with your healthcare provider to manage your treatment effectively.
- If your primary focus is daily management: Be diligent about rotating application sites and report any persistent or worsening skin irritation to your doctor.
- If your primary focus is monitoring for safety: Stay vigilant for any sudden changes in mood, blood pressure, or mental clarity, and learn the signs of serotonin syndrome.
- If you have a complex medical history: Ensure your doctor is aware of all your conditions, particularly any mental health or cardiovascular issues, before you begin treatment.
Ultimately, being an informed and proactive patient is the best way to ensure a safe and successful therapeutic outcome.
Summary Table:
| Side Effect Category | Common Examples | Key Action |
|---|---|---|
| Application Site Reactions | Redness, itching, irritation, blistering | Rotate application site daily. |
| Systemic Side Effects | Headache, dry mouth, insomnia, diarrhea | Monitor and report persistent issues. |
| Serious Risks | Serotonin syndrome, high blood pressure, seizures | Seek immediate medical attention. |
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