What is this pill - with '900' imprint? wpi 900 yellow round small?

Drugs.com provides accurate and independent information on more than 24,000 prescription drugs, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. Data sources include Micromedex® (updated Apr 12th, 2018), Cerner Multum™ (updated Apr 5th, 2018), Wolters Kluwer™ (updated Apr 6th, 2018) and others. To view content sources and attributions, please refer to our editorial policy.