is administered to a patient with rheumatoid arthritis or osteoarthritis approximately five times per week however the serum can be administered in a dosage amount of between 0 5 to 5 doses per day the preferred dosage amount results in a significant improvement in the clinical parameters of pain swelling and walking tolerance and provides a general increase in joint mobility in patients suffering from rheumatoid arthritis further these patients do not suffer any of the side effects of the steroidal or non steroidal anti inflammatory or disease modifying drugs presently known to facilitate understanding the advantages and properties of the present invention the following example is provided to specifically illustrate the use of the equine immune serum of the present invention to prepare the equine immune serum of the present invention ten prenatal pigs were removed from a mother pig at the moment of birth the bone marrow bone tissue thymus spleen lymphatic ganglia parathyroid gland connective tissue and serous membranes were removed from each prenatal pig homogenized and suspended in a sterile 15 saline solution to form the antigen containing solution for use in generating the equine immune serum the antigen containing solution was injected into a horse at regular intervals of approximately once a week the antibody levels in the horse serum were checked regularly and when the antibody levels in the serum reached a titer of at least 100 the equine immune serum was suitable for use in the present composition for treating rheumatoid arthritis the equine immune serum as the active ingredient was prepared for administration to humans by combining the serum with inactive pharmaceutically acceptable ingredients in a suppository form a single dosage suppository of the composition of the present invention contained the following ingredients in the indicated quantities.