| Article | Drug/Class | Study design | Sample size | Follow-up (months) | Withdrawal schedule |
| Hansen 2017 | Insulin | Before-and-after study | 20 | Mean 6 | Not described |
| Sjoblom 2008 | Oral hypoglycaemics, insulin | Prospective cohort study | 98 | 6 | Orals/insulin <20 units/day: abrupt discontinuation Insulin >20 units/day: dose halved, then ceased |