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Medications that may cause falsely-elevated results for plasma and urinary metanephrines due to pharmacodynamic interference
| Plasma and urine | ||||||||
|---|---|---|---|---|---|---|---|---|
| Normetanephrine | Metanephrine | 3-Methoxytyramine | ||||||
| Antidepressants | ++ | - | - | |||||
| Phenoxybenzamine | ++ | - | - | |||||
| MAO-inhibitors | ++ | ++ | - | |||||
| Sympathomimetics | + | + | - | |||||
| Levodopa | - | - | +++ | |||||
MAO = monoamine oxidase;
clear increase;
mild increase;
no increase
