thank you for providing the brief history of you.
A thorough musculoskeletal assessment is advised .
As your age is 70, the symptoms of knee pain
are ageing related issues. Also, the medicine has its own pharmacokinetics which can possible disturb the metabolism
& the physiological reaction at most times are not documented.
you can continue the medicine for the prescribed number of days and to check if the pain in the knee joint is because of the medicine, you can stop for 3 days and see if the joint pain comes down, if the joint pain persists then the medicine has no side effects and you can continue.
Also, perform regular general body exercises to improve the metabolism, immune system and strength. Body needs medicine to control the abnormal symptoms, but in ageing you need exercises to keep the ADL at optimum.
In my clinical experience, I deal with 99% of geriatrics
and with regular exercises they have improved metabolism, improved immune system, improved drug absorption etc.
I advice you to perform regular exercises to fight the ageing process.
Jay Indravadan Patel