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1. There are meds that are made to be time-release, meaning that the given doseage is released over a period of time, often from the intestines. A time-release med, "dispenses" amounts for the given time frame. There are dangers in crushing or chewing meds that state "Time-Release" or "Extended-Release" in that you are breaking down the release component and your body is flooded with too much of the medication.
2. If you take a med with standard dosing such as zanax,
the directions and package inserts state not to chew or crush. This is because the med will go immediately into your system and you will feel the effects right away. However, it will not work for the precribed duration.
To answer your question, chewing or crushing speeds up the effects.
I personally dont like the time release xanax, they do stay in your system longer so you dont feel the effects like a 1 or 2mg immediate release. I once had 1.5 SR xanax generic and did chew them to get the immediate effect I needed, otherwise I never got immediate relief and when a panic/anxiety attack occurs it slowly eased up but took way too long for me to wait (hours of gradual relief). Other meds I have heard are dangerous to do this with such as Oxy but I have never taken that so dont know much about it. I stick with basic immediate release 1 mg xanax.