My WebMD Sign In, Sign Up

Ask Your Question

WebMD Answers

120 Characters remaining
120 Characters remaining
  • First, try and keep your question as short as possible.
  • Include specific words that will help us identify questions that may already have your answer.
  • If you don't find your answer, you can post your question to WebMD Experts and Contributors.


Posted: | Report This Report Question |

If my prescription says twice-a-day or every 12 hours, can I take it, even if there is more than 12 hours in between?


Answers From Experts & Organizations (1)

American Pharmacists Association
423 Answers
9,639 Helpful Votes

The reason why a prescription maybe dosed 12 hours is that's what was done in the studies and that's how we know the drug works and how it's going to be effective.

So if you extend that timeframe, the drug may not work as well, you may not feel better, because the drug needs that constant blood level in your system. So, in the beginning once every 12 hours you are taking it faithfully, it creates what we call steady levels. If you tend to forget a dose or take it a lot later, you might actually break up that steady dose of the medication.

And therefore that could lead to an increase in side-effects or do not help in infection or blood pressure or something else. So you really want to adhere to the dosing schedule that's on that particular prescription bottle. If you have any questions, ask your pharmacist.

This answer should not be considered medical advice...down arrowThis answer should not be considered medical advice and should not take the place of a doctor’s visit. Please see the bottom of the page for more information or visit our Terms and Conditions.up arrow

| Report This Report Answer

Was this helpful?


Thanks for your feedback.

59 of 88 found this helpful
Read the Original Article: WebMD Ask the Pharmacist: Saving Money on Medicine