When you were switched, I'm assuming a doctor made this decision to switch out Lexapro for Paxil and add on Klonopin? Are they aware of your also taking propranolol? Drug interactions are real but typically doctors try to be aware of a patients full history as long as you provide it to them. A pharmacist where you fulfil your prescriptions is also a great source of information. In general, paxil and klonopin are frequently prescribed together. They are safe in terms of drug interactions but for the patient, side effects can increase. That is individual to the patient though. Do you take the beta blocker on a regular basis for your heart or for acute bouts of anxiety such as giving a speech?
As with Mom, I'm a bit confused -- you also don't say if you're tapering slowly off the Lexapro to avoid withdrawals. You don't want to be on both Lexapro and Paxil unless, as some psychiatrists do, you're switching at the very end of the taper and therefore almost off the Lexapro. So assuming you're off the Lexapro and not suffering withdrawal from quitting it, the question you didn't answer for us is why the switch, and why to Paxil, and why to two drugs at the same time? While it's true many or even most anxiety sufferers are put on a benzo and an antidepressant at the same time, it's not necessarily a good practice. It depends on if you're using the benzo as needed or regularly, because in the latter case you're using an addictive drug every day to address the same issue the antidepressant is supposed to eventually handle and one drug might do the job. As to safety, other than the problem if you're saying you're being put on Lexapro and Paxil at the same time, which we're hoping you're not saying, these drugs are sometimes used together, but again, if you're taking them all for anxiety, a process called augmentation, you're supposed to start with one and see if it does the trick. If it doesn't, you add another. But most docs are still handing them out in bunches. More details would help us tell you how it accords with out experience.
Your system can become passive to Paxil within one year. Withdrawals are brutal and some withdrawal symptoms can be permanent, like brain zaps. I do not recommend remaining on Paxil. Only take propranolol with other psych meds if you have high diastolic BP or too fast a heart beat. Propranolol is very mildly effective for anxiety. I take Klonopin only at the onset of a panic attack. I let it disolve under my tongue. The combination of the three should not be routinely taken.