In pharmacy practice, gtt is a common abbreviation that appears on prescriptions and medication labels. Understanding what gtt means helps patients and caregivers follow dosing instructions accurately.
Here you will find a clear overview of gtt, how it is used in medication orders, and practical guidance for interpreting it in everyday pharmacy scenarios.
| Term | Full Form | Category | Typical Use in Pharmacy |
|---|---|---|---|
| gtt | guttae | Abbreviation | Denotes drop(s) for liquid or semi-liquid medications |
| mL | milliliter | Volume unit | Standard measure for larger liquid doses |
| bID | bis in die | Dosing frequency | Twice a day |
| q4h | quaque 4 hora | Dosing interval | Every 4 hours as needed |
How GTT Is Written On Prescriptions
Typical Prescription Examples With GTT
Prescribers often write gtt or gtts when the dose is small and better expressed in drops rather than milliliters. You might see sig lines such as "1 gtt in the affected ear" or "2 gtts into the eye" on eye or ear drop prescriptions. The number before gtt indicates how many drops should be administered.
Understanding Drop Factor And Measurement
Drop Factor Explained
Drop factor refers to the number of drops that equal one milliliter for a specific device. Standard drop factors are usually 10, 15, 20, or 60 drops per mL, depending on the equipment and formulation. For example, a macrodrop set might deliver 15 drops per mL, while a microdrop set could deliver 60 drops per mL.
Knowing the drop factor is essential for nurses and caregivers to convert gtts into a reliable volume. This helps ensure the patient receives the correct amount of medication each time.
Practical Guidance For Patients And Caregivers
Using Eye Or Ear Drops At Home
When a prescription uses gtt, read the instructions carefully and count each drop as one unit. Do not guess or assume that a few drops equals a specific milliliter amount unless your pharmacist has explained the conversion for your device. Always use the provided dropper or measuring tool to avoid dosing errors.
Key Takeaways For Safe Use Of GTT In Medication
- gtt stands for guttae, meaning drops in Latin
- Always follow the exact number of drops prescribed
- Understand your device’s drop factor for accurate dosing
- Use only the provided dropper or measuring tool
- Ask your pharmacist if you are unsure about converting drops to mL
FAQ
Reader questions
Is gtt the same as a milliliter?
No, gtt refers to drops, while mL is a volume measurement. The number of drops in one mL depends on the drop factor of the device used.
How many drops are in 1 mL for most liquid medicines?
For many standard eye or ear drops, 1 mL is roughly equivalent to 20 drops, but this can vary based on the formulation and delivery device.
Can I use a kitchen spoon to measure gtt?
No, kitchen spoons are not accurate for measuring drops or small volumes. Use the dropper or measuring device provided with the medication.
What should I do if I miss a dose indicated with gtt?
Check your prescription label or contact your pharmacist for specific instructions. Take or administer the missed dose as soon as you remember, unless it is almost time for the next dose.