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Concerta, Methylphenidate, Ritalin Side Effects

Written by: Martin Winkler
First version: 22 Jul 2008. Latest version: 22 Jul 2008.

Abstract:

For most patients, Ritalin side effects are mild and stop after a short period of use.

Question:

What are typical Concerta, Methylphenidate, Ritalin side effects?

Answer:

Typical side effects of psychopharmacotherapy with stimulants like methylphenidate (Ritalin, Concerta) or amphetamines are usually mild and restricted to the first days or weeks of therapy. Typical adverse effects can be explained by the stimulation of the autonomic nervous system (sympathetic and parasympathetic).

The activation of the sympathetic nervous system can cause a mild increase of the pulse. But some patients report palpitations or tachycardia (trembling or fast, irregular heartbeat). Usually, this will not cause any severe problems. Blood pressure might increase slightly, but usually not more than 5 mm Hg. This is relevant for patients with hypertension problems.

Sometimes there may be symptoms of dizziness. The most common side effects due to the activation of the sympathetic nervous system are sleep problems (insomnia). So, usually stimulants should not be taken in the late afternoon or evening. (But some patients have less sleeping problems if they take a low dose of stimulants in the late afternoon because their brain calms down). Typical reactions of the parasympathetic system are:

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