| 
 | 
| Medications and adverse events | Observed adverse event (>5% of patients) (>5% of patients)
 | Serious adverse event | 
| 
 | 
| 5-ALA | (i) Common cold symptoms (ii) Menstrual pain
 (iii) Diarrhea
 (iv) Headache [12]
 | None | 
| 
 | 
| Metformin | (i) Diarrhea (ii) Nausea
 (iii) Abdominal discomfort
 (iv) Metallic taste
 (v) Vitamin b12 deficiency
 | Lactic acidosis in patients lowered eGFR (contraindicated if <30 mL/min per 1.73 m2) [21, 47] | 
| 
 | 
| DPP4 | (i) Dizziness (ii) Headache
 (iii) Nasopharyngitis
 (iv) URTI
 | (i) Severe arthralgia (ii) Acute pancreatitis
 (iii) Hepatic dysfunction
 (iv) Serious skin reactions [21, 24]
 | 
| 
 | 
| Sulfonylureas | (i) Weight gain (ii) Dizziness
 (iii) Headaches
 (iv) Sulfonamide allergies
 | (i) Higher mortality after myocardial infarctions (ii) Hypoglycemia [48, 49]
 | 
| 
 | 
| Meglitinides | Weight gain | Hypoglycemia (possibly less than sulfonylureas) [50] | 
| 
 | 
| TZDs | (i) Weight gain (ii) Edema
 (iii) Macular edema
 (iv) Raised LDL (rosiglitazone)
 (v) Decrease in hematocrit and hemoglobin when combined with other antihyperglycemic
 | (i) Bladder cancer (pioglitazone) (ii) Higher rate of myocardial infarctions (rosiglitazone)
 (iii) Heart failure
 (iv) Fractures
 (v) Hypoglycemia [21, 51–53]
 | 
| 
 | 
| Alpha-glucosidase inhibitors | (i) Bloating, flatulence (ii) Diarrhea
 | (i) Deranged LFTs (acarbose) [21] | 
| 
 | 
| SGLT2 inhibitors | (i) Vulvogavinal candidiasis (ii) Urinary tract infections
 (iii) Hypotension
 (iv) Dehydration
 | (i) Fatal urosepsis (ii) Pyelonephritis
 (iii) Bone fracture (canagliflozin)
 (iv) Diabetic ketoacidosis [21, 49]
 | 
| 
 | 
| Lipase inhibitors | (i) Abdominal pain (ii) Fecal urgency
 (iii) Steatorrhea
 (iv) Vitamin deficiencies (A, D, E, K)
 (v) Drug interactions
 (vi) Flu symptoms
 | (i) Acute kidney injury (ii) Oxalate nephropathy [5, 31, 54]
 | 
| 
 | 
| GLP-1 receptor agonists | (i) Nausea, vomiting (ii) Diarrhea
 | (i) Pancreatitis (ii) Gallbladder disease
 (iii) Renal injury [28, 53, 55]
 | 
| 
 |