I have been on losartan potassium 100mg and a diuretic for several years. I used to take both medications at night but decided to change to taking my medication during the day around 3pm as taking the water tablet meant I needed to get up in the night to go to the loo. Since then nearly every night about 11 - midnight I experience dizziness and when I check my pulse I've discovered that it's gone quite a bit low - usually 56/58. During the day my pulse is ok. I've just spoken to a GP today and he said it won't be my medication that's doing this but I question this because other forum users have also mentioned having dizziness. I'm due to have an ECG and blood tests done next week but feel quite worried now.