Family Medicine for $200

You are playing Jeopardy! and pick the category "Family Medicine for $200."

Alex Trebek reads, "A 60 year old post-menopausal woman is prescribed this medication 'for bones' but her physician neglects to tell her how to take it; she takes it with a sip of water before going to bed and gets severe esophageal pain..."

Challenge: You hit the buzzer and say, "What is...?"

Image is in the public domain.