Hello and thank you for using HCM.I carefully read your question and I understand your concern. I will try to explain and give you my opinion. You should know that when we treat hypertension our goal is to keep mean blood pressure values below 140 / 90 mmHg. I must say that values between 150-200 mmhg are pretty high and we should not leave them like that. But you should not worry about it. Hypertension is a chronic disease,it has hereditary factors but you just have to find an adequate treatment and every think would be ok. In my opinion amlodipine 5 mg is a very smoll dosage for your high values. If I was your treating doctor I would recommend some examination like a cardiac echo to evaluate heart function and walls, a full blood analyze to chek renal function and a holter pressure monitoring to see your mean blood pressure values during day and night. After all these we can better jude what to do whith your medical treatment. We can rise the amlodipine dosage up to 10 mg and add othe class of medicament like a ce - inhibitors, b-bllocker ect according to your previous examinations. Hope I was helpfull. Best regards, Dr.Ervina.