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.

If you provide additional keywords, you may be able to browse through our database of Scientific Response Documents.

Our scientific content is evidence-based, scientifically balanced and non-promotional. It undergoes rigorous internal medical review and is updated regularly to reflect new information.

topotecan injection Description

11 DESCRIPTION

Topotecan is a semi-synthetic derivative of camptothecin and a topoisomerase inhibitor. The chemical name for topotecan hydrochloride is (S)-10-[(dimethylamino)methyl]-4-ethyl-4,9-dihydroxy-1H-pyranoindolizino[1,2-b]quinoline-3,14-(4H,12H)-dione 1.25 hydrochloride. It has the molecular formula C23H23N3O5∙xHCl (x=1.25) and a molecular weight of 467.02. It is soluble in water and melts with decomposition at 213°C to 218°C.

Topotecan hydrochloride has the following structural formula:

Chemical Structure

Topotecan Injection for intravenous use is supplied as a sterile, non-pyrogenic, clear, yellow to yellow-green solution in single-dose vial at a topotecan free base concentration of 4 mg/4 mL (1 mg/mL).

Each mL contains 1 mg topotecan free base (equivalent to 1.11 mg of topotecan hydrochloride), 5 mg tartaric acid, NF and water for injection, USP. It may also contain hydrochloric acid and/or sodium hydroxide to adjust the pH. The solution pH ranges from 2.6 to 3.2.

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.