Kojecky V, et al. - The efficacy and tolerability of polyethylene glycol (PEG) to sodium picosulfate/magnesium citrate (SPMC) and low-volume polyethylene glycol/ascorbic acid (PEGA) were compared in a single- or split-dose regimen for colonoscopy bowel preparation. When used in similar regimens, PEG, PEGA and SPMC were fully comparable in terms of colonic cleansing. In all agents, the split-dose preparation was more effective. Compared to PEG, SPMC and PEGA were better tolerated. The preparation regimen and/or the volume did not affect tolerability.