Focused on Delivering High Quality Products and Service

To report Adverse Events or Product Complaints, or for Medical Inquiries:

Phone: (877) 99-Impax (46729), option 2
Phone: (510) 240-6450, option 2
Impax Laboratories
31047 Genstar Road
Hayward, CA 94544
Attention: Medical Affairs

Follow link below for the Impax Adverse Event and Product Complaint Report Form:

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit, or call (800) FDA-1088.

For Customer Service related questions (product orders, delivery, billing, account, etc.)

Phone: (877) 99-Impax (46729), option 3
Fax Customer Service Department: (215) 558-4353 (for orders), (215) 558-4418 (for returns)
Email Customer Service Department: