title: [Acute reduction of blood pressure: comparative study of nifedipine and clonidine].
abstract: OBJECTIVE
  To compare the efficacy of clonidine and nifedipine in rapidly reducing blood pressure (BP).
  
  
  METHODS
  Forty-four patients with arterial hypertension of any cause were selected and randomly divided in three groups: P group, consisting of 9 patients who received placebo; N group, consisting of 17 patients, 8 males, mean age of 47 years who received 10 mg of sublingual nifedipine; C group, consisting of 18 patients, 6 males, with mean age of 47 years who received 0.2 mg of clonidine per os. The BP were measured on admission and every 15 minutes for 1 hour. The final goal of treatment was to lower diastolic pressure in 20 mmHg or more.
  
  
  RESULTS
  At the end of 60 minutes the nifedipine as well as clonidine were equally effective in lowering BP. The earliest manifestation of drug activity occurred at 25 minutes after administration. Side effects were noted only with clonidine in 23% of the cases, but without any clinical significance.
  
  
  CONCLUSIONS
  Nifedipine as well as clonidine are equally effective in rapidly lowering BP with minimal side effects.
authors.affiliation: Universidade Federal de Juiz de Fora e Instituto Nacional de Assisténcia Médica e Previdéncia Social (INAMPS) de Juiz de Fora.
authors.forename: J
authors.initials: J
authors.lastname: Dondici Filho
authors.forename: J C
authors.initials: JC
authors.lastname: Gomes
authors.forename: E G
authors.initials: EG
authors.lastname: de Castro
authors.forename: N S
authors.initials: NS
authors.lastname: Luz
authors.forename: A
authors.initials: A
authors.lastname: Abzaid
mesh_terms: D000328:Adult; D000368:Aged; D001794:Blood Pressure / Q000187:drug effects; D003000:Clonidine / Q000008:administration & dosage / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D006973:Hypertension / Q000188:drug therapy*; D008297:Male; D008875:Middle Aged; D009543:Nifedipine / Q000008:administration & dosage / Q000627:therapeutic use*; D016032:Randomized Controlled Trials as Topic
chemical_list: D009543:Nifedipine; D003000:Clonidine
vernacular_title: Redução aguda da pressão arterial: estudo comparativo entre nifedipina e clonidina.