What is gtt (guttae, or drops)?

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From the Guidelines

GTT stands for "guttae," which is Latin for "drops" and is commonly used in medical prescriptions to indicate eye drops, ear drops, or other liquid medications administered in drop form. When you see "gtt" on a prescription, it typically specifies how many drops should be administered. For example, "2 gtt OS tid" means "2 drops in the left eye three times a day." The abbreviation is part of the traditional medical shorthand system that helps healthcare providers communicate precise dosing instructions. According to a study published in the American Family Physician in 2001 1, a small volume is defined as a few drops, which is consistent with the use of "gtt" in medical prescriptions. Some key points to consider when administering drops include:

  • Following the exact number prescribed as each drop contains a specific amount of medication
  • Proper administration technique involves tilting the head back, pulling down the lower eyelid to form a small pocket, and placing the drops in this pocket without touching the dropper to the eye to prevent contamination. This abbreviation system helps standardize medication instructions across healthcare settings. In the context of medical prescriptions, gtt is a crucial abbreviation that ensures accurate and safe administration of liquid medications. Healthcare providers should be familiar with this abbreviation and its implications for patient care. Key aspects of using "gtt" in prescriptions include:
  • Specifying the number of drops to be administered
  • Ensuring proper administration technique to prevent contamination and ensure effective medication delivery.

From the Research

Definition of Gtt

  • Gtt is an abbreviation for "guttae," which is Latin for "drops" 2, 3, 4, 5, 6.

Uses of Gtt

  • Gtt is commonly used to refer to eye drops, which are used to administer medication or other substances directly to the eyes 2, 3, 4, 5, 6.
  • Eye drops can be used for a variety of purposes, including to treat eye infections, reduce inflammation, or to lubricate the eyes 2, 3, 4, 5, 6.

Administration of Gtt

  • Gtt is typically administered by instilling a few drops of the medication or substance into the eye 2, 3, 4, 5, 6.
  • The frequency and dosage of gtt administration can vary depending on the specific condition being treated and the medication being used 2, 3, 4, 5, 6.

References

Guideline

Guideline Directed Topic Overview

Dr.Oracle Medical Advisory Board & Editors, 2025

Research

Diagnostic Uses of Common Eye Drops.

Journal of ocular pharmacology and therapeutics : the official journal of the Association for Ocular Pharmacology and Therapeutics, 2024

Research

Treatment with citicoline eye drops enhances retinal function and neural conduction along the visual pathways in open angle glaucoma.

Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie, 2015

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

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