| Article | Drug/Class | Study design | Sample size | Follow-up (months) | Withdrawal schedule |
| Daly 1983 | Digoxin | Before-and-after study | 15 | 1 | Not described |
| Fair 1990 | Digoxin | Before-and-after study | 32 | 11 | Not described |
| Fonrose 1974 | Digoxin | Placebo-controlled before-and-after | 31 | 4 | Not described |
| Macarthur 1990 | Digoxin | Before-and-after study | 14 | 18 | Not described |
| Sommer 1981 | Digoxin | Before-and-after study | 20 | 15 | Abrupt discontinuation |
| Wilkins 1985 | Digoxin | Before-and-after study | 19 | 4 | Not described |