The concomitant utilization of opioids with other opioid analgesics, for example butorphanol, nalbuphine, pentazocine, may well lessen the analgesic impact of acetaminophen and codeine phosphate tablets and/or precipitate withdrawal signs.If concomitant usage of a CYP3A4 inhibitor is necessary or if a CYP3A4 inducer is discontinued, look at dosage … Read More