The chemicals troops were exposed to in the Persian Gulf included pyridostigmine bromide, which was used as prophylaxis to prevent death in an attack with nerve gas agents. (sciencedaily.com)
It is acceptable to use pyridostigmine in conjunction with corticosteroids or azathioprine (Imuran Rx), which are immunosuppressive medications and might help with a drug reaction. (vetinfo.com)
It may be possible to withdraw pyridostigmine in the future, which would be helpful if it is the cause of problems. (vetinfo.com)