Hello and thank you for using HCM. I carefully read your question and I understand your concern.I will try to give you my opinion. Supraydin in a multivitamin capsule. It mainly contains vitamin A,E,D. It doesn t have elements that can interfere with your existing blood preassure treatments. But you should take this kind of multivitamins if you are diagnosed to have deficit of this vitamins like vit D,E, deficit in minerals like Magnezium ect. So, the main think to discus in your case is to explore the reason why you feel weak. Taking tree medication like tenormin,norvasc and aspirin is not a reason to feel weak. Only if you have very low blood pressure below 100/70 mmHg and frequencies under 50 beat for minute the medications might be the reason and you have to lower they re dosage. But if you have normal blood pressure, normal frequencies and normal heart function its not the medication fault. So,if i was your treating doctor i will ask a fool blood analyze with your minerals, electrolytes your thyroid hormones and a cardiac echo to better understand the cause of your weakness. If you have normal mineral and vitamin levels it has no sense taking capsule supplements. Hope I was helpfull. Wish you goog health. Best regards.