This product is tested for solubility in water at 50 mg/mL. Other published sources state that this compound is also soluble in organic solvents such as DMSO and alcohols. Solution stability studies have not been perofrmed, however the Chlorpromazine HCl analytical standard, product C-904, is a 1 mg/mL solution in methanol. This item is not assigned an expiration date and is considered stable for at least 1 year from the date of shipment when stored at ?20°C.
Please see the link below to review the product datasheet:
https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/documents/966/223/c8138pis.pdf
Please see the link below to review a publication related to the stability of this compound in water:
http://onlinelibrary.wiley.com/doi/10.1038/sj.bjp.0705283/pdf