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  • Title: The effect of L-dopa with and without decarboxylase inhibitor on growth hormone secretion in children with short stature.
    Author: Fevang FO, Stoa RF, Thorsen T, Aarskog D.
    Journal: Acta Paediatr Scand; 1977 Jan; 66(1):81-4. PubMed ID: 831384.
    Abstract:
    The efficiency of L-dopa alone and L-dopa plus a dopa-decarboxylase inhibitor (carbidopa) in provoking growth hormome (GH) secretion was studied 40 children with short stature. By preventing the extracerebral metabolism, carbidopa increases the availability of L-dopa to the brain. The study was designed as paired series of growth hormone stimulation tests in which the effect of L-dopa alone, in different dosage schedules, was compared with the same dose level of L-dopa plus carbidopa, When L-dopa was given in full dose (125-500 mg), there was no significant difference in the serum GH concentrations at any time of sampling. In the lower dose level, the stimulant effect of L-dopa alone tended to be exceeded by the combination of L-dopa and carbidopa. The serum GH responses to the different schedules indicate that an optimal hypothalamic dopamine concentration for GH release could be achieved with a considerably lower dose of L-dopa than those employed in previously reported studies. When L-dopa is combined with a dopa decarboxylase inhibitor, the children have the advantage of less side effects in the form of nausea and vomiting.
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