Home > Community > What does TDS mean on a medical prescription? I know it’s three times a day, but is it every four hours or every eight hours?
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Nick Roberts

What does TDS mean on a medical prescription? I know it’s three times a day, but is it every four hours or every eight hours?

Barry Smith  Follow

Thanks for the Q&A!

You’re right. TDS means three times a day. So, the question is how many hours apart from each dose?

It depends but the golden rule of TDS is always every 8 hours.

For example, insulin Actrapid are usually prescribed as TDS to control the post prandial (after meal) blood glucose level, so it is injected at least 30 minute before having meals (breakfast, lunch, dinner).

For medications that are indicated to relieve symptoms such as fever, cough, flu, and simple allergy, they are prescribed as TDS PRN (three times a day, when required). In this case, you can take the meds whenever you have such symptoms with at least 4 to 8 hours apart from each dose and at maximum of three times a day. Since it is PRN dosing, you can stop taking it after the symptom is relieved.

Some antibiotics dosing are written as TDS as well but it can be misleading as the purpose of antibiotic is to provides coverage throughout the day. So it has to be taken strictly every 8 hourly (24 hour / 3 times = 8 hours). In other words, instead of TDS, it should be written as Q8H (every 8 hourly).

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Carol Chandler Jones  Follow

Steven Glazier provided an excellent answer to your question. TDS means distributing the three doses evenly during your waking hours, meaning that not necessarily strictly every 8 hours. Most people, however, take it to mean 8 hourly and that is fine if you could manage that schedule.

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BJ Chippindale  Follow

TDS/TID translates to “three times a day,” or (roughly) every 8 hours. Most people do one in the morning, one midday, and one at bedtime - it depends on your schedule what times those are. It doesn’t have to be exact - if it did, it would be written as q8, or “every 8 hours”

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Andrew Yap  Follow

TDS is Latin for “ter die sumendum” which means three times a day. Typically that means every 8 hours. When you are unsure about dosing, it is always best to check with the doctor who wrote the script or check with the pharmacist who filled it for you.

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Choko Canyon  Follow

Every 8 hours

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Burtay Mutlu  Follow

See the problem is doctors have, for centuries, worked very hard to keep those troublesome humans wanting care from getting “involved” in their care.

They can be so troublesome and think they should be able to give their opinion.

To that end, they made a deal with the pharmaceutical profession to encode prescriptions into Latin.

Known only to priests and doctors, and pharmacists(but only by agreement)

TDS on a script means “ter die sumendum“ which means “three times a day”.

That’s all.

Check this:

List of medical abbreviations: Latin abbreviations - Wikipedia

And thank you for the question.

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Chris Rodriguez  Follow

TID means 3x/ day. It depends on what medicine you are taking. Some medicines are before meals or after meals.You can take it every 8 hours but you might be sleeping when it’s due so it’s better to take the 3rd medicine before going to bed.

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