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Based on our results brand name oral antibiotic formulations do not necessarily taste better than their generic counterparts.
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Erythromycin estolate (EE) added to perfusing medium of isolated rat liver caused a dose-dependent decrease of both perfusate and bile flows. Biliary bile acid analysis showed that EE decreased both bile acid excretion rate and concentration. This suggests that EE interferes with the formation of bile acid dependent fraction of bile. EE is known to cause, in some individuals a reversible cholestatic hepatic injury. Our data if applicable to clinical setting indicate that an intrinsic toxicity of EE may contribute to the development of hepatic damage.
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Randomised controlled trials comparing any antibiotic regimen with placebo or no treatment in pregnant women with ureaplasma detected in the vagina.
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In a 6-volunteer cross-over study the pharmacokinetics of 3 erythromycin preparations were compared. A single oral dose of 500 mg of each preparation was administered at each occasion and the levels measured in timed samples of plasma and saliva. Markedly higher blood concentrations of the estolate and propionate were obtained compared to the stearate. Comparison of serum and plasma concentration of the drugs from each split sample showed no significant differences. Plasma concentrations always exceeded those in saliva but for any one preparation a similar ratio was obtained at different times. This may be useful to ascertain compliance and to measure concentration of the compounds where direct measurement in plasma is not practicable.
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Thirteen trials with 2197 participants met the inclusion criteria: 11 trials investigated treatment regimens; 2 investigated prophylaxis regimens. The quality of the trials was variable.Short-term antibiotics (azithromycin for three to five days, or clarithromycin or erythromycin for seven days) were as effective as long-term (erythromycin for 10 to 14 days) in eradicating Bordetella pertussis (B. pertussis) from the nasopharynx (relative risk (RR) 1.02, 95% confidence interval (CI) 0.98 to 1.05), but had fewer side effects (RR 0.66, 95% CI 0.52 to 0.83). Trimethoprim/sulfamethoxazole for seven days was also effective. Nor were there differences in clinical outcomes or microbiological relapse between short and long-term antibiotics. Contact prophylaxis of contacts older than six months of age with antibiotics did not significantly improve clinical symptoms or the number of cases developing culture-positive B. pertussis.
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Inhibition of canalicular bile acid efflux by medications is associated with clinical liver toxicity, sometimes in the absence of major liver effects in experimental species. To predict the hepatotoxic potential of compounds in vitro and in vivo, we investigated the effect of clinical cholestatic agents on [3H]taurocholic acid transport in regular and collagen-sandwich cultured human hepatocytes. Hepatocytes established a well-developed canalicular network with bile acid accumulating in the canalicular lumen within 15 min of addition to cells. Removing Ca2+ and Mg2+ from the incubation buffer destroyed canalicular junctions, resulting in bile acid efflux into the incubation buffer. Canalicular transport was calculated based on the difference between the amount of bile acid effluxed into the Ca/Mg2+-free and regular buffers with linear efflux up to 10 min. Hepatocytes cultured in the nonsandwich configuration also transported taurocholic acid, but at 50% the rate in sandwiched cultures. Cyclosporin A, bosentan, CI-1034, glyburide, erythromycin estolate, and troleandomycin inhibited efflux in a concentration-dependent manner. In contrast, new generation macrolide antibiotics with lower incidence of clinical hepatotoxicity were much less potent inhibitors of efflux. An in vivo study was conducted whereby glyburide or CI-1034, administered iv to male rats, produced a 2.4-fold increase in rat total serum bile acids. A synergistic 6.8-fold increase in serum total bile acids was found when both drugs were delivered together. These results provide methods to evaluate inhibitory effects of potentially cholestatic compounds on bile-acid transport, and to rank compounds according to their hepatotoxic potential.
Although antibiotics were effective in eliminating B. pertussis, they did not alter the subsequent clinical course of the illness. There is insufficient evidence to determine the benefit of prophylactic treatment of pertussis contacts.
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Children with suspected group A beta-hemolytic streptococcal pharyngitis are encountered daily in outpatient settings. Despite the ubiquity of this condition, important management issues still remain unresolved. This article will review selected epidemiologic, diagnostic, and therapeutic topics germane to clinical practice.
Rat hepatocytes were used to study the toxicity of a new semisynthetic macrolide, roxithromycin, in comparison with erythromycin base and erythromycin estolate. Roxithromycin caused lactate dehydrogenase leakage close to that of erythromycin estolate and higher than erythromycin base after 21 h of exposure to the drugs. This effect was, at least in part, explained by the higher uptake: roxithromycin was two to three times more concentrated by liver cells than erythromycin base. For both roxithromycin and erythromycin base, the uptake depended on time, temperature, and extracellular antibiotic concentration. The accumulated macrolides egressed rapidly when cells were incubated in antibiotic-free medium. No uptake and no loss of accumulated drugs were observed at 4 degrees C. After accumulation by hepatocytes, roxithromycin and erythromycin base underwent similar subcellular distribution, mostly concentrating in cytosol and lysosomes. The small amount accumulated in the other particulate fractions followed the order mitochondria much greater than nuclei greater than microsomes. Roxithromycin, however, was less concentrated than erythromycin base in the microsomes.
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PL chronica (PLC) was recorded in 37% of the cases, PL et varioliformis acuta (PLEVA) in 57.3%, and clinical features of both disorders were seen simultaneously in the remaining. The median age of onset was 60 months (range: 6-180 months), although the median age of onset of PLEVA (median: 60 months) was significantly younger than that of PLC (median: 72 months) (P = .03). The age distribution showed peaks at 2 to 3 years (24.8%) and 5 to 7 years (32%). A history of infection or drug intake preceded the skin manifestations in 30% and 11.2% of patients with PLC and PLEVA, respectively. The disease began most commonly during winter (35%) or fall (30%). The median duration was 20 months (range: 3-132 months) in patients with PLC and 18 months (range: 4-108 months) in patients with PLEVA. Involvement was diffuse in 74.2% of the patients, peripheral in 20.2%, and central in the remainder. The disease was recurrent in 77% of the patients (n = 80). Of the patients, 59% had pruritus, whereas 32% reported no symptoms; the remainder had fever, arthralgia, or both. Erythromycin estolate or ethylsuccinate was administered to 79.7% of the affected children; 66.6% of these showed at least a partial response.
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There was no difference in the development of respiratory tract symptoms compatible with a case definition of pertussis in the erythromycin- and placebo-treated groups. There were 20 households with secondary culture-positive cases of pertussis; 4 households in the erythromycin-treated group and 15 in the placebo-treated group (efficacy of erythromycin chemoprophylaxis for bacterial eradication 67.5% [95% confidence interval: 7.6-88.7]). However, medication-associated adverse reactions were reported by 34.0% of erythromycin and 15.7% of placebo recipients.
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More than 120,000 patients are treated annually in Germany to resolve repeated episodes of acute tonsillitis. Therapy is aiming at symptom regression, avoidance of complications, reduction in the number of disease-related absences in school or at work, increased cost-effectiveness and improved quality of life. The purpose of this part of the guideline is to provide clinicians in any setting with a clinically focused multi-disciplinary guidance through different conservative treatment options in order to reduce inappropriate variation in clinical care, improve clinical outcome and reduce harm. Surgical management in terms of intracapsular as well as extracapsular tonsillectomy (i.e. tonsillotomy) is the subject of part II of this guideline. To estimate the probability of tonsillitis caused by β-hemolytic streptococci, a diagnostic scoring system according to Centor or McIsaac is suggested. If therapy is considered, a positive score of ≥3 should lead to pharyngeal swab or rapid test or culture in order to identify β-hemolytic streptococci. Routinely performed blood tests for acute tonsillitis are not indicated. After acute streptococcal tonsillitis, there is no need to repeat a pharyngeal swab or any other routine blood tests, urine examinations or cardiological diagnostics such as ECG. The determination of the antistreptolysin O-titer (ASLO titer) and other antistreptococcal antibody titers do not have any value in relation to acute tonsillitis with or without pharyngitis and should not be performed. First-line therapy of β-hemolytic streptococci consists of oral penicillin. Instead of phenoxymethylpenicillin-potassium (penicillin V potassium), also phenoxymethlpenicillin-benzathine with a clearly longer half-life can be used. Oral intake for 7 days of one of both the drugs is recommended. Alternative treatment with oral cephalosporins (e.g. cefadroxil, cefalexin) is indicated only in cases of penicillin failure, frequent recurrences, and whenever a more reliable eradication of β-hemolytic streptococci is desirable. In cases of allergy or incompatibility of penicillin, cephalosporins or macrolides (e.g. Erythromycin-estolate) are valuable alternatives.
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All randomised controlled trials that compared any antibiotic regimen with placebo or no treatment in pregnant women with ureaplasma detected in the vagina.
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The records of 124 children who were given the diagnosis of PL at our institution between 1993 and 2003 were retrospectively reviewed.
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During a 1-yr period an increased incidence of hypertrophic PS was noted in a closed referral population. These patients demonstrated a temporal relationship between the ingestion of EE and the development of PS. A sequence of events from pylorospasm to pyloric tumors was suggested from the data.
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In an open randomized multicenter study 190 culture-positive pediatric ambulatory pertussis patients were treated for 14 days with either erythromycin estolate (EST) (n = 93; 40 mg/kg/day divided in 2 doses) or erythromycin ethylsuccinate (ETH) (n = 97; 60 mg/kg/day divided in 3 doses). On day 14 Bordetella pertussis was recovered from cultures of 2 patients (2.2%) treated with EST and 1 patient (1.0%) treated with ETH. Despite the fact that 151 patients (79.4%) had reached the early paroxysmal stage at initiation of antimicrobial therapy, clinical improvement was seen in the majority (reduced frequency and severity of coughing: EST, 77.4 and 67.7%; ETH, 74.2 and 63.9%, respectively). Drug-related side effects were noted in 11 patients (11.8%) treated with EST and 16 patients (16.5%) treated with ETH (P greater than 0.05) and consisted mainly of minor gastrointestinal complaints. Erythromycin estolate in a lower dose administered only twice a day was equivalent to erythromycin ethylsuccinate in all aspects and proved to be adequate antimicrobial treatment for pertussis patients.
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To determine the etiology of community-acquired pneumonia in ambulatory children and to compare responses to treatment with azithromycin, amoxicillin-clavulanate or erythromycin estolate.
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In a crossover design study, we compared the plasma bactericidal activities of erythromycin estolate (500 mg) and erythromycin ethylsuccinate (600 mg) after administration of a single oral dose to 12 healthy volunteers. Both erythromycin esters displayed very good plasma bactericidal activities against Streptococcus pneumoniae. The median bactericidal titers produced in plasma against Streptococcus pyogenes and Streptococcus pneumoniae were significantly higher with erythromycin estolate than with the ethylsuccinate ester at both 2 and 8 h after dosing (P less than 0.05 by Student's t test). Both erythromycin esters showed rather weak bactericidal activity against Branhamella catarrhalis; a further look at these results indicated that erythromycin estolate presented 50% of the plasma samples at 2 h with bactericidal titers superior or equal to 1:8, versus 11% for the ethylsuccinate ester. Of the 60 plasma bactericidal activity tests performed against Staphylococcus aureus, only 6 (10%) and 3 (5%) exhibited titers of 1:8 or greater for erythromycin estolate and erythromycin ethylsuccinate, respectively. Clinical trials are warranted in which these products are compared in infections other than Streptococcus pyogenes pharyngitis, for which the clinical superiority of erythromycin estolate has been demonstrated.
To determine whether erythromycins, sulfonamides, and tetracyclines are associated with an increased risk for acute hepatitis.
Using prescription-event monitoring to determine whether erythromycin estolate was a more frequent cause of jaundice than erythromycin stearate or tetracycline 12 208 patients, for whom 5343 doctors had prescribed one of the three drugs, were identified by the Prescription Pricing Authority. Of the questionnaires sent to general practitioners about the possible occurrence of jaundice, 76% were returned. There were 16 reports of jaundice, of which four were attributable to gall stones, three to cancer, six to viral hepatitis, and only three were possibly related to an antibiotic. All three patients, in whom the antibiotic was a possible cause, had been treated with erythromycin stearate. No case was attributable to the estolate which had previously been suspected of being a more frequent cause of jaundice. Although the incidence is unknown, it is very unlikely to be more than one in 100.
A randomized double-blind trial of 152 men with gonococcal urethritis compared the therapeutic efficacy of erythromycin estolate and erythromycin base. Twenty-one of 86 (24%) men treated with the estolate and 15 of 66 (23%) treated with the base had recurrent or persistent gonococcal infection when seen after a 9-g course of erythromycin. The serum erythromycin activity among estolate-treated patients (3.57 +/- 0.84 microgram/ml) was nearly twice that for base-treated patients (1.76 +/- 0.80 microgram/ml). Our findings do not support routine use of erythromycin for treatment of pregnant, penicillin-allergic patients.
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All randomised and quasi-randomised controlled trials of antibiotics for treatment of and contact prophylaxis against whooping cough were included in the systematic review.
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The tetracyclines are active in vitro against many urinary tract pathogens such as Chlamydia, Mycoplasma pneumoniae, Brucella, rickettsiae, and Nocardia. Chloramphenicol is used primarily for anaerobic infections, Haemophilus influenzae meningitis, and infections due to Salmonella typhi. Erythromycin is active in vitro against M. pneumoniae, Legionella spp., Streptococcus pneumoniae, and group A beta-hemolytic streptococci; it may also be used as prophylactic therapy for subacute bacterial endocarditis and for recurrence of acute rheumatic fever in patients who are allergic to penicillin. Clindamycin should be used primarily for the treatment of anaerobic infections. The tetracyclines may cause gastrointestinal upset; phototoxic dermatitis; hepatitis, especially in pregnant women; discoloration of the teeth and bone dysplasia in the human fetus and in children; and superinfections, especially oral and anogenital candidiasis. The tetracyclines should be used with caution in patients with renal insufficiency. The most important toxic effect of chloramphenicol is bone marrow suppression, which is dose related or idiosyncratic. The incidence of undesirable side effects associated with the use of erythromycin is low; gastrointestinal irritation is the most common, and cholestatic hepatitis may occur with the use of erythromycin estolate. Pseudomembranous colitis is the most important toxic effect associated with the use of clindamycin.
The potential value of oral erythromycin for antitetanus prophylaxis in non-immune patients with open wounds was assessed. Serum obtained by venepuncture from health persons 2 h after an oral dose of an erythromycin preparation was used as a culture medium rendered anaerobic by addition of cooked meat. Strains of Clostridium tetani inoculated into these sera failed to multiply when the donor had taken 500 mg of erythromycin estolate before a meal; other erythromycin preparations and the estolate at a dosage of 250 mg were ineffective or inconsistent in their inhibition of the growth of Cl. tetani. Human antitetanus globulin (ATG) was given to 12 patients, 9 with severe injuries and 3 with extensive burns, all of whom were judged, from their history, to be non-immune (or with expired immunity); all except one had received large intravenous infusions of blood and/or other fluids. Serum antitoxin assays by a mouse protection technique on days 0, 1--2, 3--5, 6--10 and 14+ showed no detectable antitoxin (less than 0.01) unit/ml) in the initial (pre-ATG) sample from three patients with severe injuries and in one with extensive burns. All the patients in the severely injured group showed an early appearance or increase in tetanus antitoxin to protective titres. Two of the three severely burned patients showed, respectively, a delayed appearance or an increase in antitoxin; the other burned patients showed a reduction from the initial pre-ATG titre, followed by a return to that titre after day 5.