4794
Both systolic and diastolic blood pressures of these 13 patients were decreased significantly after 4 weeks of nifedipine therapy , and blood pressure was maintained within the normal range thereafter for 25 months .
 Chemical: nifedipine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: nifedipine