| Article | Drug/Class | Study design | Sample size | Follow-up (months) | Withdrawal schedule |
| George 2003 | Nitrates | RCT | 120 | 3 | Abrupt discontinuation |
| Jackson 2005 | Nitrates | Before-and-after study | 55 | 3 | Halved the nitrate dose for 2 days then discontinue if no increase in symptoms occurred |