I looked the pill up on your identifier and it wouldn't tell me if it was 12 or 24 hour but it said it is Controlled Release. It is a Caplet (not a Capsule, like I have always had) it is blue and one side is blank and the other is M 411. Please help me with this, I need to now if this is 24 hour or not. I always had a capsule and it was mfg: Watson. I take this for blood pressure but also tachycardia. Thank you so much. If I can get anything to show 12 or 24hr, then they will replace it. Thank you, thank you, thank you. Lisa