What pill is very small, white, round, with a 'l' in the middle? No markings on the other side?

Pill imprint 1 has been identified as Metoprolol tartrate 25 mg.

Metoprolol is used in the treatment of high blood pressure; heart failure; angina; atrial fibrillation; supraventricular tachycardia (and more), and belongs to the drug class cardioselective beta blockers. Risk cannot be ruled out during pregnancy.

Metoprolol 25 mg is not subject to the Controlled Substances Act.

Click on the link to view an image of the pill:

https://www.drugs.com/imprints/1-6964.html