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Alendronate helps to reduce osteoclastic activities (cells that reduce bone density) while calcium help ostéoblasts (cells that helps to form bones). With a diagnosis of osteoporosis, calcium alone is not enough. There are alternative to Alendronate is you have to many side effects (another pill called risedronate or injections every 6 months of Prolia)
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Geneviève Duperron suggests meeting with your pharmacist.