Of the 29 participants who reported poor adherence ( < 80 % of doses taken ) , the following barriers to treatment were reported : changed mind about taking treatment ( 24 % ) , consumption of alcoholic beverages ( 18 % ) , nausea ( 18 % ) , forgetfulness ( 12 % ) , stomach pain ( 12 % ) , difficulty in swallowing pills ( 6 % ) , no reason ( 6 % ) or bad taste of the pills ( 6 % ) .