Medical Information
United States
 

In order to provide you with relevant and meaningful content we need to know more about you.

Please choose the category that best describes you.

This content is intended for U.S. Healthcare Professionals. Would you like to proceed?

I am a U.S. Healthcare ProfessionalYes, I am a U.S. Healthcare Professional
SelectI am a U.S. Healthcare ProfessionalYes, I am a U.S. Healthcare Professional
I am a U.S. Patient / CaregiverNo, go back to the patient portal
SelectI am a U.S. Patient / CaregiverNo, go back to the patient portal
Non-US residents click here.

alfentanil injection, USP Description

11 DESCRIPTION

Alfentanil Injection, USP contains alfentanil, an opioid agonist, chemically designated as N- [1- [2-(4-ethyl-4,5-dihydro-5-oxo-1H-tetrazol-1- yl) ethyl]-4-(methoxymethyl)-4-piperidinyl]-N-phenylpropanamide monohydrochloride (1:1) with a molecular weight of 452.98 and an n-octanol: water partition coefficient of 128:1 at pH 7.4. The structural formula of Alfentanil HCl is:

Chemical Structure

Alfentanil Injection, USP is a sterile, non-pyrogenic, preservative free aqueous solution containing alfentanil hydrochloride equivalent to 500 mcg per mL of alfentanil base for intravenous injection. The solution, which contains sodium chloride for isotonicity, has a pH range of 4.0 to 6.0. Each mL contains:

Active: Alfentanil base 500 mcg.

Inactive: Sodium Chloride 9 mg and Water for Injection q.s.

Show All Hide All
Show All Hide All
Did you find an answer to your question? Yes No
Didn’t find what you were looking for? Contact us.
MI Digital Assistant

Chat online with Pfizer Medical Information regarding your inquiry on a Pfizer medicine.

Call 800-438-1985*

*Contact Medical Information.

Medical Inquiry

Submit a medical question for Pfizer prescription products.

Report Adverse Event
Pfizer Safety

To report an adverse event related to Pfizer-BioNTech COVID-19 Vaccine (also known as COMIRNATY®, COVID-19 mRNA, Vaccine BNT162b2 or BNT162) or Pfizer COVID-19 Treatment (also known as PAXLOVID™ (nirmatrelvir tablets; ritonavir tablets)), and you are not part of a clinical trial* for this product, click the link below to submit your information:

Pfizer Safety Reporting Site

*If you are involved in a clinical trial for either product, adverse events should be reported to your coordinating study site.

If you cannot use the above website or would like to report an adverse event related to a different Pfizer product, please call Pfizer Safety at
(800) 438-1985.
FDA Medwatch
You may also contact the U.S. Food and Drug Administration (FDA) directly to report adverse events or product quality concerns either online at www.fda.gov/medwatchor by calling
(800)-332-1088.