Dh. Gonzales et al., Bupropion SR as an aid to smoking cessation in smokers treated previously with bupropion: A randomized placebo-controlled study, CLIN PHARM, 69(6), 2001, pp. 438-444
Background: Many persons who attempt to quit smoking have made previous uns
uccessful attempts to quit with pharmacologic aids. An understanding of the
impact of these previous attempts to quit is vital for selecting medicatio
ns that may be more successful in a future attempt to quit. In particular,
the effect of repeated use of bupropion SR (Zyban; INN, amfebutamone) on ab
stinence rates has not been studied previously.
Methods: This was a multicenter, randomized, double-blind, placebo-controll
ed study in 450 smokers who had previously used bupropion in a smoking cess
ation attempt. The study consisted of a screening phase, a 12-week treatmen
t phase, and a follow-up at month 6. Participants made regular clinic visit
s throughout the treatment phase during which they received brief counselin
g sessions to encourage abstinence from smoking. The primary end point was
continuous abstinence from smoking from weeks 4 through 7. Secondary effica
cy end points were examined throughout the treatment phase and at follow-up
after 6 months.
Results: In participants receiving bupropion SR, 27% (61 of 226) remained a
bstinent throughout the period from weeks 4 through 7 compared with 5% (11
of 224) of participants receiving placebo (P < .001). Significantly (P < .0
01) more participants who received bupropion SR during the treatment phase
remained continuously abstinent from the start of week 4 through month 6 (2
7 of 226; 12%) compared with participants who received placebo (5 of 224; 2
%). Eleven participants receiving placebo (5%) and 19 participants receivin
g bupropion SR (8%) stopped taking the study medication because of an adver
se event.
Conclusions: Bupropion SR is an effective medication for retreatment of smo
kers who have used bupropion SR previously.