I Have Taken Losartan Potassium 100 Mg Per Day For

I have taken Losartan potassium 100 mg per day for several years. They have always been a green pill with an E on one side and the number 47 on the other. I recently had a refill and what I got was a white pill with 100 on one side and 115 on the other. I questioned the pharmacist and he told me they were always changing things around. My question is do I have the right medication. First time I have ever had that happen.