Discuss the mode of action of the drugs used in the treatment of asthma.  word limit 1500 (excluding reference) All sources of information must be referenced in a bibliography at the end of your essay The assignment will be marked on your ability to research a pharmacological topic of current interest based on information published in research papers, and present your findings in a clear, concise and informative fashion.  Attention should be made to the biological mechanisms of drug action.