"i have been on alprazolam for 10 years for panic disorder and anxiety.  i am still on the same dosage that i was ten years ago and i am definitely sure that drug companies differ in their drug production.   whenever i pick up a prescription and the pharmacy tells me it&#039;s &quot;just a different company&quot;, the red flag goes up.  the oval shaped 1 mg. tablet just does not work as well at the round 1 mg. tablet."