I found a pill with imprint 5 on one side and the letters ZPL on the other, what is it?

Pill with imprint ZLP 5 is White, Round and has been identified as Zolpidem tartrate 5 mg. It is supplied by Sandoz Pharmaceuticals Inc..

Zolpidem is used in the treatment of insomnia and belongs to the drug class miscellaneous anxiolytics, sedatives and hypnotics. Risk cannot be ruled out during pregnancy. Zolpidem 5 mg is classified as a Schedule 4 controlled substance under the Controlled Substance Act (CSA).

pill image https://www.drugs.com/imprints/zlp-5-11313.html