Which of the following is NOT an adverse effect of morphine?

Morphine, an opioid analgesic, is primarily known for its pain-relieving properties, but it does come with a range of known adverse effects. Among these are dizziness and sedation, nausea and vomiting, as well as constipation. These effects are often encountered in patients who receive morphine due to its interaction with opioid receptors in the central nervous system and gastrointestinal tract.

Rash, however, is not commonly associated with morphine use in the same way that the other side effects are. While any medication can potentially cause an allergic reaction that may lead to a rash, rashes are not typical responses to morphine itself. Thus, it is correct to identify that a rash is not a standard adverse effect of morphine, setting it apart from the more widely recognized effects like dizziness, sedation, nausea, and constipation that many patients experience while on this medication.