What are side effects of taking Xanax (alprazolam) or loritab if they are not prescribed?

Very dangerous. Both are controlled substances and should only be taken under the advice physician. Xanax (alprazolam) or Alprazolam is a benzodiazepine medication, is habit forming and can result in sign. Sedation.. Lortab, an opioid, is habit-forming and can result in sign sedation. In larger doses both can cause difficulty breathing, and when used IV in combination are common cause of accidental death by overdose.