Liquid protein formulations containing cimetidine

A liquid composition comprising:

• (i) from about 100 mg/ml to about 300 mg/ml of an antibody;
• (ii) from about 0.1 M to about 0.25 M of cimetidine or a pharmaceutically acceptable salt thereof;
• and
• (iii) a pharmaceutically acceptable solvent;
• wherein the composition, when in a volume suitable for subcutaneous or intramuscular injection, has an absolute viscosity from about 1 cP to about 100 cP at 25° C. as measured using a cone and plate viscometer or a microfluidic viscometer, and wherein the absolute viscosity of the composition is less than an absolute viscosity of a control composition, the control composition comprising the antibody and the pharmaceutically acceptable solvent but without the cimetidine or pharmaceutically acceptable salt thereof.