Blood levels of growth hormone, insulin and glucose were studied in 63 patients before and after intravenous levodopa (1.5 mg/kg), oral levodopa (0.5 g and 1.0 g) and amantadine (100 rag). A significant increase of growth hormone concentrations was found after intravenous and oral 1.0 g doses. No significant differences were found in insulin and glucose concentrations.
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