The solubility of this product is in DMSO at 1 mg/ml or higher.
In biological experiments, water is the most preferred solvent. However, several organic compounds are either not soluble in water or degrade rapidly in the presence of moisture. If DMSO is a recommended solvent, it is best to use a fresh stock bottle that is deemed free of any moisture. Any contaminating moisture may accelerate the degradation of the compound in question or may render it insoluble. It is best to make the initial serial dilutions only in DMSO and then add the final diluted sample to your buffer or the incubation medium. The final concentration of DMSO in vivo should not exceed more than 0.1 %.
Please see the general information about the use of inhibitors in animals and these data sheets from other γ-Secretase Inhibitors from Calbiochem, which may be useful:
http://www.emdmillipore.com/product/-Secretase-Inhibitor-I-Calbiochem,EMD_BIO-565750#anchor_PDS
http://www.emdmillipore.com/product/-Secretase-Inhibitor-XX-CAS-209984-56-5-Calbiochem,EMD_BIO-565789#anchor_PDS