Essential Thrombocythemia: Making treatment decisions

I have ET and was diagnosed 2 years ago. I am 50 Years old and my latest platelet count was 1,183,000. I only take a baby aspirin daily. My hematologist said I could try Hydroxyurea if I wanted. I am low risk and at first I didn’t want to take it. My platelet count continues to climb. I am thinking about trying the medication. Anyone else tried it? Any ill side effects?