Losartan is a really good drug with few side effects. 50 mg is not a high dose. It should not be causing any of the problems you mention. Ask your doctor.
Losartan is effective drug that helps to keep blood vessels, lowers blood pressure and recovers flow of blood in the body. This medicine is used to treat high blood pressure. There are some side effects of every medicine such as –
1. Stomach pain
2. Bladder pain
3. Blurred vision
4. Depression
5. Breathing problem
6. Cold sweats
7. Irregular heartbeat
8. Nausea
9. Back and chest pain
10. Dark urine
If you experience any of these side effects then immediately consult your doctor.