Phase IV randomized preference study in patients eligible for calcium and vitamin D supplementation.

Introduction/objectives: Preference for supplement formulation helps determine an individual's adherence to long-term medication and can improve clinical benefit for chronic illnesses such as osteoporosis. This study compared the preference, acceptability and tolerability of a reformulation of Calcichew D3 500 mg/400 IU and Calcichew D3 500 mg/800 IU (Takeda UK Ltd, Wobrun Green, UK) with Adcal-D3 500 mg/400 IU (ProStrakan Ltd, Galashiels, UK) and Kalcipos-D 500 mg/800 IU (Meda Pharmaceuticals Ltd, Bishop's Stortford, UK), respectively.

Method: This phase IV, randomized, open-label, two-period, cross-over study was conducted at nine sites in the UK and Germany.