I've Had Some Side Effects With Losartan 50 Mg, Such

I've had some side effects with losartan 50 mg, such as constipation feel tachycardia lost night of voice dark urine little urinary frequency, before taking lisinopril and I was coughing a lot so I they switched to losartan, I am a person operated in open heart with three baypass makes year and four months, I also feel that many problems to sleep. I have another alternative with another pill?I've had some side effects with losartan 50 mg, such as constipation feel tachycardia lost night of voice dark urine little urinary frequency, before taking lisinopril and I was coughing a lot so I they switched to losartan, I am a person operated in open heart with three baypass makes year and four months, I also feel that many problems conciliar tngo sleep. I have another alternative with another pill?