Development of acute withdrawal during periodic administration of amphetamine in rats

2004 ◽  
Vol 79 (1) ◽  
pp. 55-63 ◽  
Author(s):  
W WHITE
Keyword(s):  
Acute Withdrawal ◽  
Periodic Administration

scholarly journals Comparative study of once-weekly azithromycin and once-daily amoxicillin treatments in prevention of recurrent acute otitis media in children.

1996 ◽  
Vol 40 (12) ◽  
pp. 2732-2736 ◽  
Author(s):  
P Marchisio ◽  
N Principi ◽  
E Sala ◽  
L Lanzoni ◽  
S Sorella ◽  
...  
Keyword(s):  
Otitis Media ◽  
Randomized Study ◽  
Acute Otitis Media ◽  
Occurrence Rate ◽  
Once Daily ◽  
Recurrent Acute Otitis Media ◽  
Periodic Administration ◽  
Resistant Strains ◽  
Selection Of

Continuous chemoprophylaxis is effective in the prevention of new episodes of acute otitis media (AOM) in otitis-prone children, but compliance can be a problem and thus efficacy can be decreased. Intermittent chemoprophylaxis has so far shown conflicting results. Azithromycin, which has a peculiar pharmacokinetics, resulting, even after a single dose, in persistently elevated concentrations in respiratory tissues, could permit a periodic administration with higher compliance. We compared a 6-month course of once-weekly azithromycin (5 or 10 mg/kg of body weight) with that of once-daily amoxicillin (20 mg/kg) in a single-blind, randomized study of prophylaxis for recurrent AOM in 159 children aged 6 months to 5 years with at least three episodes of AOM in the preceding 6 months. In the amoxicillin group, 23 (31.1%) of 74 children developed 29 episodes of AOM, while in the 10-mg/kg azithromycin group, 11 (14.9%) of 74 children experienced 15 episodes. The 5-mg/kg/week azithromycin trial was prematurely interrupted after nine cases, due to the high occurrence rate of AOM (55.5%). During the 6-month prophylaxis period, the proportion of children with middle ear effusion declined similarly in both groups. No substantial modification of the nasopharyngeal flora was noted at the end of prophylaxis in both antimicrobial groups. In the 6-month-postprophylaxis follow-up period, about 40% of children in both groups again developed AOM. Azithromycin at 10 mg/kg once weekly can be regarded as a valid alternative to once-daily low-dose amoxicillin for the prophylaxis of AOM. Although in the present study no microbiological drawback was noted, accurate selection of children eligible for prophylaxis is mandatory to avoid the risk of emergence of resistant strains.

scholarly journals Acute-Withdrawal Restless Legs Syndrome Following Abrupt Cessation of Short-Term Tramadol

2014 ◽  
Vol 11 (2) ◽  
pp. 204 ◽  
Author(s):  
Young-Min Park ◽  
Hye Kyeong Park ◽  
Leen Kim ◽  
Heon-Jeong Lee ◽  
Seung-Gul Kang
Keyword(s):  
Restless Legs Syndrome ◽  
Short Term ◽  
Abrupt Cessation ◽  
Restless Legs ◽  
Acute Withdrawal

scholarly journals Restless Leg Syndrome Induced by an Acute Withdrawal of Oxycodone

2015 ◽  
Vol 6 (2) ◽  
pp. 84-86 ◽  
Author(s):  
Joon Hyun Baek ◽  
Su-Hyun Han ◽  
Sang-Ahm Lee
Keyword(s):  
Restless Leg Syndrome ◽  
Acute Withdrawal

scholarly journals Working Memory Performance after Daily Caffeine Intake: Compromised Performance and Reduced Hippocampal Activity.

2021 ◽  
Author(s):  
Yu-Shiuan Lin ◽  
Janine Weibel ◽  
Hans-Peter Landolt ◽  
Francesco Santini ◽  
Helen Christina Slawik ◽  
...  
Keyword(s):  
Working Memory ◽  
Memory Performance ◽  
Error Rates ◽  
Caffeine Intake ◽  
Cognitive State ◽  
Placebo Condition ◽  
Memory Functions ◽  
Acute Withdrawal ◽  
Caffeine Withdrawal ◽  
Significant Difference

Neuroprotective effects of caffeine have been frequently reported in the context of disease and cognitive dysfunction as well as in epidemiological studies in humans. However, evidence on caffeine effects on neural and memory functions during daily intake in a healthy cognitive state remains scarce. This randomized double-blind placebo-controlled crossover study investigated working memory functions by N-back tasks and functional magnetic resonance imaging (fMRI) after daily caffeine intake compared to a placebo baseline and to acute caffeine withdrawal in 20 young healthy volunteers. Each volunteer was given 3 times 150 mg caffeine for 10 days in the daily caffeine condition, 3 times 150 mg mannitol for 10 days in the placebo condition, and 9-day caffeine plus 1-day mannitol in the acute withdrawal condition. During the 10th day, participants performed 4 N-back sessions (two loads each: 0- and 3-back) under controlled laboratory conditions. During the 4th session of N-Back (i.e. at 5.5 h, 36.5 h and > 10 days after the last caffeine intake in the caffeine, withdrawal, and placebo condition, respectively) we assessed blood-oxygen-level-dependent (BOLD) activity. During the entire 10th day, in 0-back tasks, we observed longer reaction times (RTs) in the withdrawal compared to the placebo (Cohens d = 0.7) and caffeine condition (Cohens d = 0.6), but no significant effects of conditions on error rates. In contrast, in 3-back tasks (controlled for 0-back), the RTs in the caffeine condition were longer compared to placebo (Cohens d = 0.6) and withdrawal (Cohens d = 0.5). Error rates were higher during both caffeine and withdrawal conditions compared to placebo (Cohens d of both contrasts = 0.4). Whole-brain analyses on fMRI data did not reveal significant condition-dependent differences in activities between task loads. Across task loads, however, we observed a reduced hippocampal activation (Cohens d = -1.3) during the caffeine condition compared to placebo, while no significant difference in brain activities between withdrawal and placebo conditions. Taken together, the worse working memory function and the hippocampal hypoactivation implicate a potential detrimental effect of daily caffeine intake on neurocognitive functions of healthy adults. Moreover, they echo the hippocampal volumetric reduction reported previously in the same volunteers. Lastly, acute withdrawal from daily caffeine intake impairs both low-order cognitive processes and working memory performance. Taking earlier studies on acute caffeine effects into account, our findings indicate that daily caffeine intake elicits a dynamic change in cerebral activities during the course of repeated consumption, with unknown consequences in the long run.

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