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That's because every drugs has a certain therapeutic levels to be effective. Your body naturally starts to remove the drugs from the system the moment they enter the blood stream. Certain drugs can be removed quicker than others. So, in order to maintain the level in the blood, a drug has to be replaced at a regular interval to be effective. This interval is determined by the half life of the drug. That's the time it take for the concentration to reduce in half.

Keep in mind that this half life time is the average. In reality, everybody is different. The conditions of your liver, kidneys, as well as, other medications/chemicals/food can alter the half life.

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Q: Why are there qid and tid treatments?
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Related questions

Explain the difference between bid and q12h?

hi there its the same, i.e. bid=q12h tid=q8h qid=q6h

What does qid bid tid in drug dose mean?

They are directions indicating how many times per day the dose should be administered. It goes like this: SID or QD = Once a day BID = Twice a day TID = Three times a day QID = Four times a day However, The Joint Commission which acredits hospitals and nursing homes has recommended that these abbreviations be discontinued because they lead to errors in dosing. Now, physicians must write out the words, "once a day," "twice a day" and so on.

What do you do when your sailing and you are tid?

What is tid?

What does PID mean on a prescription?

PID is not an abbreviation in common usage for prescriptions. BID means twice daily, TID means three times daily, QID means four times daily, and PRN means "as needed".

What does the medical abbreviation sig 2 puff QID 30 days mean?

2 puffs qid ud means 2 puffs four times daily as needed.

When was Jaktens tid created?

Jaktens tid was created in 2001.

When was Ny Tid created?

Ny Tid was created in 1975.

What is tid mean?

TID means three times a day.

What does Tterb TID mean?

"TID" stands for "three times daily."

Is this the correct way to abbreviation take medication 4 times a day q4d?

No. Four times per day is qid. (3x/day is tid; 2x/day is bid; 1x/day is qd.) q4d would mean every four days, I suppose.

When was Ny Tid - Trondheim - created?

Ny Tid - Trondheim - was created in 1899.

When did Ny Tid - Trondheim - end?

Ny Tid - Trondheim - ended in 1947.