There are a few OTC (over the counter) medications for nervousness and anxiety. Benadryl (diphenhydramine), melatonin, and KalmPro are OTC medications that can be used for nervousness and anxiety. Benadryl and melatonin can be used on an as-needed basis for anxiety that is triggered by certain situations, such stage fright and performance anxiety. You can take Benadryl or melatonin right before your speech or performance to calm your nerves. However, you have to take the right dose, as Benadryl and melatonin can be quite sedating. I recommend you take a test dose before your actual performance. For Benadryl, the dose can range from 12.5mg to 50mg one hour before your performance, and for melatonin, the dose can range from 1mg to 3mg.
If you want long term relief from anxiety and nervousness, then you can take KalmPro. KalmPro is a natural anxiety supplement formulated with ingredients that have research studies that show effectiveness and safety for anxiety. In addition, KalmPro was formulated by a psychiatrist who has clinical, research, and teaching experience with anxiety. The following video gives a review on KalmPro: