I have been prescribed propranolol for anxiety 40mg. I am supposed to take one when needed?

Thanks for your reply Wildcat. Do you think that 40mg is a high dose for anxiety symptoms? I am just worried that it slows your heartbeat and can lower your blood pressure. I am probably being silly to worry but I just think perhaps I should cut the tablet in half?

I do think you can cut the tablet in half. We are all different, but for me personally a 10mg tablet works well all day. You can always take another dose, until you figure out how your body reacts.

No, 40mgs as needed (PRN) is a very low dose. It's not going to hurt your heart rate because during an anxiety attack your blood pressure soars.
If in doubt, verify your dosage with the health care provider who prescribed the medication for you.

I have been prescribed Propranolol for anxiety too. 40mg up to three times a day. I've decided against using it for the reasons you cite. Instead I've found other means of tackling panic attacks:

I eat a banana if I feel one starting (bananas are natural beta blockers. They block adrenaline from binding to beta receptors. There's stuff on the Internet about it).

I also exercise, drink green tea and chamomile tea, use ginger, use lavender oil and use alternate nostril breathing. Listening to music helps too.

I'm currently being checked out for pheochromocytoma as well. Pheochromocytoma mimics anxiety and depression symptoms and raises blood pressure.

Propranolol does work for some people, but I don't want to become dependent on it myself.

You won't if you take it as directed (as needed).