Amlodipine
"Im a 38 yr old female. I was prescribed Amlodopine 10 mg in April bc my bp was 150/99. After taking it for a week, I woke up one morning and I was having trouble walking. The doctor told me that I had Achilles tendinitis. My Achilles (back both of ankles) had swollen knots on them.  Im an active person, and I knew that I hadn't injured both of my ankles at the same time. 1 month later, I went to the Sports medicine doctor who also told me that I had Achilles tendinitis. He sent me to physical therapy for 6 weeks. PT did not help me at all. I googled Achilles tendinitis & amlodipine together. A doctor did a study in 1999 that connected the 2. I stopped the amlo & 2 weeks later my ankles were 70% back to normal."