Yes, it is possible to experience a panic attack even while taking medication like citalopram. The medication helps make the attacks less frequent and less intense, but it may not have reached its full effect yet. It can take up to 4-6 weeks for the medication to be fully effective. If you feel a panic attack coming on, it is helpful to have prescribed medication on hand to manage it. There are also many resources available online and offline to help you cope with panic attacks and improve your overall mental health. If you need tips or advice on managing a panic attack or your mental health in general, don't hesitate to reach out for support.