Efficacy of Somatropin in Adult Patients With Isolated Growth Hormone Deficiency

Patients of Placebo Group will be treated with placebo sub-cutaneous in the same way as Somatropin during the double blind treatment phase. To maintain blind subject will be measured in the same way as the treatment group for IGF-I- Levels. Central lab will randomize placebo patients to dose change or maintenance of dose. This will ensure continued blinding of the study to patients and personnel.

Fixed doses for patients: MALE: \< 45y 0,4 mg, \> 45y 0,2mg FEMALE: \< 45y 0,5mg, \>45y 0,3mg. for the first 4 weeks half of the dose will be given. After that dose will be increased to the targeted maintenance dose according to IGF-I Levels +/- 2 SD of age adjusted reference range. In case of side effects dosage will remain on half-dose (during the first 4 weeks) or reduced to half dose (after the first 4 weeks). At week 52 patients have the opportunity to switch to open label study restarting with half the given fixed dose which will be adjusted to full dose after 4 weeks.