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Can I take mirtazapine if I have phenylketonuria?

Mirtazapine is available in regular tablets and in orally-disintegrating tablets. Phenylketonuria (PKU) is a condition in which a birth defect causes a problem with an enzyme that metabolizes the amino acid phenylalanine. The disease requires a special diet low in phenylalanine to prevent PKU symptoms like mental retardation, seizures, hyperactivity, behavioral problems and others. The orally-disintegrating tablets contain phenylalanine, which may interfere with a PKU diet. The regular mirtazapine tablets do not contain phenylalanine.

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