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Dr. Andrew Rynne

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How long do side effects of medicine take to vanish?

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Dr. Muhammad Sareer Khalil

General & Family Physician

Practicing since :2012

Answered : 2921 Questions

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Posted on Mon, 11 Aug 2014 in General Health
Question: In a reaction to a medication, do the symptoms go away as soon as the drug is out of the body or can the effects be longer lasting?
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Answered by Dr. Muhammad Sareer Khalil 3 hours later
Brief Answer:
Depends entirely on the half life of the medicine

Detailed Answer:
Hello and welcome.

Every drug or medicine has a property called half life meaning the time it takes to eliminate 50 % of a drug.

if the drug has zero order kinetics then elimination rate is independent of plasma concentration, means these drugs have no fixed half lives. A constant amount of drug is eliminated per unit time. these include ethanol phenytoin and salicylates.

if the drug has 1st order kinetics then rate of elimination depends on plasma level of the drug. most drugs follow 1st order means the higher the amount the greater the elimination.

let me know if you have any query. if not then kindly close the conversation and rate my answer.

thanks. have a nice day.
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