Final answer:
The most frequent adverse reactions of Morphine include nausea and vomiting, constipation, and respiratory depression.
Step-by-step explanation:
The most frequent adverse reactions of Morphine include nausea and vomiting, constipation, and respiratory depression. These side effects are common and can occur even when the medication is taken as directed. Other possible side effects of Morphine may include dizziness, fever, chills, headache, myalgia, dry mouth, and fatigue. However, the most frequent adverse reactions are nausea and vomiting, constipation, and respiratory depression.