Femara, prolia injections osteo

Dad is on injections every 3 weeks for his bone cancer as well as his chemo treatments. He gets it done to the skin of his stomach and I think they also add a vitamins booster in the same injection. Not sure if his symptoms are from the injection or just plain cancer but he says getting out of bed in the morning is painful but once he's up and moving about he's ok. He is 76 and doesn't use any mobility aids and lives by himself in a little unit. He's doing ok on his treatment.