Colchicine is a supressor of hepatic CYP1A2 and theophylline is a sensitive CYP1A2 probe substrate. When the two are co-administered the potential exists for a clinically significant drug interaction. This study aims to determine the effect of steady-state colchicine on the pharmacokinetics of theophylline administered as a single dose. A secondary goal is to evaluate the safety and tolerability of this regimen in healthy volunteers. All study subjects will be monitored for adverse events throughout the entire study period.