Hi All, I have RA and am on 12.5mg of methotrexate by injection. I also have Asthma. At the moment I feel as if I have the start of a chest infection and wondered if I can take Clarithromycin with this. I was in hospital this time last year with a chest infection and very bad asthma attack so have these antibiotics in. These were prescribed by the hospital in case I needed them.