I had been taking 50mg of Milpharm's sertraline last month and was doing really well and finally feeling like myself again. However, when I ordered the next month's prescription from Pharmacy2U they sent me a different brands (Teva) sertraline. Teva's tablets are bigger and blue, whereas the Milpharm's are white and smaller. I am currently on day 6 of taking Teva tablets and have noticed my symptoms creeping back including intrusive thoughts and i am feeling less balanced than i did before I was taking the Teva ones.
I wanted to just check if anyone has changed brands of sertraline and experienced a difference in side effects or had a reaction to trying a new brand? Do you think I should contact my GP about the change in tablets?

Thank you!