My mother has been taking- (3 tablets) mirtazapine 15 mg and 1 tablet - aripiprazole (10 mg), since 2 months now, the combination has been very effective in treating her ocd and depression, but since a week she has been experiencing some side effects like- weight gain, tiredness, motor skills not functioning slow, unable to walk fast, she also experiences brain zaps, even though she's taking the medicine regularly. Are these side effects common? How to deal with these side effects, when the medicine has actually helped her overcome ocd and depression a lot. Is changing medicine a good option?