“…This review summarized the available results of studies on AEs comparing MS+AP cotreatment with AP and MS monotherapy, and finding that the AE risk is higher in patients receiving co-treatment, both in general and also pertaining to many specific AEs. Based on these results, efficacy advantages of co-treatment strategies need to be evaluated in light of potential AE disadvantages, which requires that clinicians routinely assess both efficacy and safety/tolerability of the frequently occurring combination therapies in patients with BD [48] and take into account the potential pharmacokinetic drug--drug interactions between MS and AP [23,25,49,50]. Furthermore, the finding, although based on a very small set of studies and indirect comparisons, that addition of MS to APs is associated with a lower AE burden than the reverse should be followed up in studies that concurrently assess efficacy and tolerability of both augmentation strategies.…”