2355
Recent studies have shown that under experimental conditions ferrous sulfate may reduce the gastrointestinal absorption of orally administered levothyroxine sodium in patients with primary hypothyroidism .
 reduce the gastrointestinal absorption of orally administered levothyroxine sodium, ferrous sulfate
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 reduce the gastrointestinal absorption of orally administered levothyroxine sodium, ferrous sulfate