I am going to Malawi, Africa, for a month. I am supposed to take chloroquine. I am unsure about taking it along with other medications that I take. I take Omeprazole, losartan hctz, and tamoxifen. This is dry season there and not as bad as some times. I am a young 73 and other than the blood pressure issue and the reflux, I am in good health and active. I do a lot of traveling. But, I am concerned about the interactions.