I started on Losartan 100mg about 5 months ago. No bad effects At first but the past 6 weeks, I have become more fatigued, my head feels like it's in a box, runny nose is bothersome too. About 2 weeks ago, I felt so terrible that I decided to cut the tablets in half after not taking it at all for three days. I'm concerned because my cardiologist says Losartan doesn't cause those side effect. Thanks in advance for any input.