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Pharmacy Calculations for Pharmacy Technicians: Concentrations, Dilutions and Drug Dosing

This activity is for pharmacy technicians and is sponsored by Postgraduate Healthcare Education, LLC (PHE).
There has been no commercial support for this activity.


Casey J. Covrett, PharmD, BCPS
Freelance Medical Writer
Wilmington, North Carolina


Laura K. Stinson, PharmD
Owner and Director of Clinical Operations
The Stinson Pen, LLC
Lexington, KY

Editorial Note:
Contributions to educational materials: Material released August 20, 2014 through August 20, 2017 under ACPE UAN 0430-0000-014-048-H04-T developed and written by Casey Covrett, PharmD, BCPS. Updated with additional writing and references in 2017 by Laura K. Stinson, PharmD


Casey J. Covrett, PharmD, BCPS, has no relevant affiliations or financial relationships with a commercial interest to disclose.

The following reviewer, Laura K. Stinson, PharmD, hereby states that she does not have any financial relationships or relationships to products or devices with any commercial interest related to the content of this activity.

Susanne Batesko, RN, BSN, and Robin Carrino, as well as the planners, managers, and other individuals, not previously disclosed, who are in a position to control the content of Postgraduate Healthcare Education (PHE) continuing education (CE) activities hereby state that they have no relevant conflicts of interest and no financial relationships or relationships to products or devices during the past 12 months to disclose in relation to this activity. We are committed to providing participants with a quality learning experience and to improve clinical outcomes without promoting the financial interests of a proprietary business.


Postgraduate Healthcare Education, LLC is accredited by the Accreditation Council for Pharmacy Education as a provider of continuing pharmacy education.
UAN: 0430-0000-17-065-H04-T

Credits: 2.0 hours (0.20 ceu)
Published: August 31, 2017
Last Review: August 8, 2019
Expires: August 31, 2020
Type of Activity: Knowledge
Media: Internet

Fee Information: The fee for this educational activity is $4.50 per registrant.

Estimated time to complete activity: 120 minutes


This accredited activity has been designed for pharmacy technicians.


During the period August 31, 2017 through August 31, 2020, participants must 1) read the learning objectives and faculty disclosures; 2) study the educational activity; and 3) complete the posttest and the evaluation form. To answer the questions, click on your selected choice for each answer then proceed to the next question. Once completed, click on Submit Posttest at the bottom of the page. Your posttest will automatically be graded. If you successfully complete the posttest (score of 70% or higher), your Statement of Credit will be made available immediately. Click on View Certificate and print the Statement of Credit for your records. If you receive a score lower than 70%, you will receive a message notifying you that you did not pass the posttest. You will have 2 opportunities to pass the posttest.


The goal of this activity is to improve the pharmacy technician's ability to solve math problems related to drug concentrations, dilutions, and individualized drug dosing.


Upon completion of this activity, participants should be better able to:

  1. Apply the method of alligation when mixing solutions or solids with different percent strengths;
  2. Perform liquid and solid dilution calculations expressed in terms of weight-volume (w/v) and weight-weight (w/w);
  3. Calculate patient-specific drug doses based on ideal body weight, body surface area, and adjusted body weight;
  4. Utilize the aliquot method in pharmacy compounding when appropriate; and
  5. Verify IV flow rates to enhance patient safety.


Please ensure the computer system you plan to use meets the following minimum requirements:

  • Operating System: Windows 98 or higher & Macintosh 2.2 or higher
  • Internet Browser (Mac &/ Windows): Internet Explorer 6.0 or higher, Google Chrome, Safari 5.0.6 or higher, Firefox 3.0.3 or higher & Opera 5 or higher
  • Broadband Internet connection: Cable, High-speed DSL & any other medium that is internet accessible
  • Peripherals: Computer speakers or headphones
  • Monitor Screen Resolution: 320 x 480 or higher
  • Media Viewing Requirements: Adobe Reader, Microsoft PowerPoint, Flash Player & HTML5

Disclosure of Unlabeled Use and Disclaimer

The opinions expressed in the educational activity are those of the faculty and do not necessarily represent the views of Postgraduate Healthcare Education, LLC. Participants have an implied responsibility to use the newly acquired information to enhance patient outcomes and their own professional development. The information presented in this activity is not meant to serve as a guideline for patient management. Any procedures, medications, or other courses of diagnosis or treatment discussed or suggested in this activity should not be used by clinicians without evaluation of their patients' conditions, and possible contraindications on dangers in use, (review of any applicable manufacturer's product information) and comparison with recommendations of other authorities.

The author, sponsor, and publisher of this continuing education activity have made all reasonable efforts to ensure that all information contained herein is accurate in accordance with the latest available scientific knowledge at the time of acceptance for publication. However, because information regarding drugs (their administration, dosages, contraindications, adverse reactions, interactions, special warnings, precautions, etc.) is subject to constant change, the reader is advised to check the manufacturer's package insert for information concerning recommended dosages and potential problems and cautions prior to dispensing or administering the drug. Special precautions should be taken when a drug is new, or highly toxic, or is unfamiliar to the dispenser or administrant. This educational activity may contain discussion of published and/or investigational uses of agents that are not approved by the U.S. Food and Drug Administration (FDA). Neither the publisher nor sponsor promotes the use of any agent outside of approved labeling. Statements made in this monograph have not been evaluated by the FDA. Nutritional products discussed are not intended for the diagnosis, treatment, cure, or prevention of any disease.