When is the best time to take this medicine?

Mine calls for taking it the AM with breakfast.

Following are a couple of Rx links to information on this drug which includes dosage, FDA required info, and user reports. Just type in the drug name:

RxList - The Internet Drug Index for prescription drugs and medications

Drugs.com | Prescription Drugs - Information, Interactions & Side Effects

Suggest you take the time to read the information in total so as to familiarize yourself with possible side effects. Particularly those side effects experienced by patients (users), as these may not have been noted in clinical trials.