Det aktive stof i SOMAVERT, pegvisomant, ligner i høj grad somatotropin, men det er udviklet således, at det blokerer de receptorer, hvortil væksthormonet normalt bindes.
The active substance in SOMAVERT, pegvisomant, is very similar to human growth hormone, but it has been designed so that it blocks the receptors to which growth hormone normally fixes itself.