Table 6.

Classification of adverse events

Seriousness	A serious adverse event includes any untoward medical occurrence that at any dose: • Results in death, • Is life-threatening, • Requires inpatient hospitalization or prolongation of existing hospitalization • Results in persistent or significant disability/incapacity, or • Is a congenital anomaly/birth defect Important medical events that may not be immediately life-threatening or result in death or hospitalization but may jeopardize the patient or may require intervention to prevent one of the outcomes listed in the definition above may also be considered serious
Severity	Grade 1	Mild	Symptoms causing no or minimal interference with usual social and functional activities
	Grade 2	Moderate	Symptoms causing greater than minimal interference with usual social and functional activities
	Grade 3	Severe	Symptoms causing inability to perform usual social and functional activities
	Grade 4	Potentially life- threatening	Symptoms causing inability to perform basic self-care functions or medical or operative intervention indicated to prevent permanent impairment, persistent disability
	Grade 5	Death
Relationship to study products	Definitely related	The adverse event and administration of the study agent are related in time, and a direct association can be demonstrated
	Probably related	The adverse event and administration of the study agent are reasonably associated in time, and the adverse event is more likely explained by the study agent than other causes
	Possibly related	The adverse event and administration of the study agent are reasonably related in time, and the adverse event can be explained equally well by causes other than the study agent
	Probably not related	A potential relationship between the study agent and the adverse event could exist (i.e. the possibility cannot be excluded), but the adverse event is most likely explained by causes other than the study agent
	Not related	The adverse event is clearly explained by another cause not related to the study agent
	Pending	Pending may be used as a temporary relationship assessment only for death and only if data necessary to determine relationship to the study agent are being collected. The site is required to submit a final assessment within three business days after reporting the death. If no final assessment is made within three business days after the date of submission, the event will be assessed as possibly related to the study agent. Any additional information received at a later time, including an autopsy report, should be submitted as a Follow-up Report
Expectedness	Expected	Expected refers to the perspective of events previously observed, not on the basis of what might be anticipated from the pharmacological properties of the study agent
		Study drug	Expected adverse events
		Trimethoprim-sulfamethoxazole	Rash, urticaria, loss of appetite, nausea, vomiting, agranulocytosis, aplastic anemia, disease of the hematopoietic system, fulminant hepatic necrosis, severe allergic reaction, Stevens-Johnson syndrome, and toxic epidermal necrolysis
		Chloroquine	Headache, malaise, dizziness, blurred vision, difficulty focusing, muscle weakness, electrocardiogram changes, gastrointestinal upset, mouth ulcers, diarrhea, vomiting, nonurticarial pruritis, leukopenia, methemoglobinemia, and retinopathy
	Unexpected	Unexpected refers to events whose nature or severity (intensity) is not consistent with those included in the package insert/summary.