inderal 20mg 2x/day is a low dose and can be helpful.
However, in cases with "mild hyperthyroidism" I have often used a low dose of methimazole to normalize thyroid function then re-evaluate the symptoms as the inderal only treats symptoms, not really the thyroid.
I take inderal as well. I started on half the dose just to see what would happen. (10 mgs) in the morning. 6 hours later i was able to take another 10 mg. I got excellent relief.
I now take 20 mg freely in the morning. If i feel hyper in the evening, i will take 10-20 according to my symptoms.
My BP did drop, but i was borderline hyper anyway, so now i am in good range.
check your BP just to be safe. I was told a dose of 80-120mg is what is used for hypertension.
good luck