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The response of serum growth hormone levels to the long-acting somatostatin analog SMS 201-995 in acromegaly.

SMS 201-995 (SMS) is a long-acting analog of somatostatin. We studied the effect of SMS (50-100 micrograms, sc, every 8 h) on serum GH in five patients with acromegaly. Serum GH decreased significantly in four of the five patients 4 h after SMS treatment. In two of the four patients, this reduction was not sustained for 7 h, but sustained reduction to normal GH concentrations did occur in the two patients who had basal serum GH levels below 15 ng/ml. In the two patients whose responses were not sustained for 7 h, a higher dose of SMS did not cause sustained reduction in GH. SMS was well tolerated, except for one episode of elevated serum aminotransferase levels. These results indicate that SMS-induced reductions in serum GH in patients with acromegaly are often not sustained despite SMS administration every 8 h and indicate that the insufficient duration of effect may limit its therapeutic efficacy.