I presume the patient is suffering from Chronic Myeloid Leukaemia CML). The disease progression is very slow and medication is very helpful for remissions.
Glivec is the brand name. The name of the medicine is imatinib. Imatinib is also produced by Ranbaxy under the brand name of Zoleta. Thus Glivec and Zoleta are exactly same medicines but Zoleta is far cheaper. Hence I suggest that the patient is given Zoleta.
With regard to side effects, mostly they are minor. In any case there is no alternative to treatment. At the moment imatinib is treatment of choice.