A client has a new prescription for butorphanol (Stadol). Which of the following options is a complication of this medication?

A. Butorphanol (Stadol) is an opioid agonist-antagonist used for pain management. It is more likely to cause drowsiness or sedation rather than insomnia. B. Abstinence syndrome, or withdrawal symptoms, can occur in patients who are dependent on opioids. Butorphanol can precipitate withdrawal symptoms in individuals who are dependent on opioid agonists. C. Migraines are not a typical complication of butorphanol. However, butorphanol is used for pain relief, which can sometimes include migraines, but it does not cause them.