A Comparison among the Growth Hormone-Lowering Effects in Acromegaly of the Somatostatin Analog SMS 201-995, Bromocriptine, and the Combination of Both Drugs

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Abstract
The acute GH inhibitory effects of 50 .mu.g SMS 201-995, a somatostatin analog, and 2.5 mg bromocriptine were compared in 17 acromegalic patients. SMS 201-995 suppressed plasma GH levels after 2-6 h to 5 .mu.g/liter or less in 10 of these 17 patients, while bromocriptine did the same in only 5 of them. There was much variation in the responsiveness to both drugs in these patients, but the GH-lowering effect of 50 .mu.g SMS 201-995 was significantly greater than that of 2.5 mg bromocriptine. SMS 201-995 and bromocriptine together significantly suppressed plasma GH levels in 2 of 3 acromegalic patients who were insensitive to both compounds when tested separately. We conclude that most acromegalic patients respond better to SMS 201-995, while a few patients are more sensitive to the GH-lowering effect of bromocriptine. In addition, the combination of SMS 201-995 and bromocriptine can be of value in a few acromegalic patients who do not respond to either drug alone.

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