The increased understanding of the mechanisms which underlie rheumatoi
d disease has been accompanied by a more appropriate use of the limite
d repertoire of therapeutic agents. Conventional second-line drugs sti
ll have a role in everyday practice. The efficacy of these agents in r
educing the severity of clinical signs of joint inflammation, whilst a
t the same time causing significant reductions in the laboratory measu
res of the acute phase response is undoubtedly confirmed by meta-analy
sis of several therapeutic trials of these agents. Whether or not thes
e agents can influence outcome, usually assessed in terms of radiologi
cal progression, is more contentious. Furthermore, their toxicity in l
ong term use is not inconsiderable. However, newer agents may play a m
ore important part in therapy in the future. Such therapy can be desig
ned to specifically interfere with the abnormalities of the immune sys
tem which characterise rheumatoid arthritis. Many of the agents review
ed have been successfully applied to animal models of arthritis, but w
e still await large randomised controlled studies in humans to determi
ne their clinical efficacy and toxicity. In view of the complexity of
the immunological abnormalities in rheumatoid arthritis, it may be nec
essary to consider using a number of such agents in any particular pat
ient. This should result in more rational therapy in rheumatoid arthri
tis.