Actonel Combi in the UK contains 35mg of Risedronate Sodium plus 1000mg of Calcium Carbonate and 880IU of Vitamin D3. Each package of 28 contains 4 tablets of Actonel 35mg along with 24 sachets of effervescent Calcium Carbonate and Vitamin D3. Recommended weekly dosage is to take one Risedronate tablet on Day 1 followed by one Calcium/Vitamin D3 sachet on Days 2 - 7, then repeat.