Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0042963 (vomiting)
 31,883 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

A 44-year-old man with acquired immunodeficiency syndrome (AIDS) and Pneumocystis carinii pneumonia (PCP) who suffered adverse effects from treatment with trimethoprim-sulfamethoxazole (TMP-SMX) and was then treated with pentamidine isethionate is described, and approved and investigational drugs used in the management of PCP in the AIDS patient are discussed. After taking TMP-SMX, 240 mg trimethoprim and 1200 mg sulfamethoxazole, four times a day orally for 10 days at home, the patient was hospitalized complaining of nausea, vomiting, diarrhea, and fever. Intravenous TMP-SMX was begun at a dosage of 18 mg/kg/day of trimethoprim. Four days later, his condition had deteriorated and he had elevations of liver enzymes and a decrease in white blood cell (WBC) count. TMP-SMX was discontinued and pentamidine isethionate was started at a dosage of 4 mg/kg/day i.v. His symptoms and fever subsided and his liver enzyme levels and WBC count improved. After nine days of pentamidine his WBC count decreased; pentamidine was suspected as the cause and discontinued; no further therapy was needed. PCP was the initial infection that established this patient's diagnosis of AIDS. The patient did not have exertional dyspnea and nonproductive cough, which are usually seen in AIDS patients with PCP. TMP-SMX 20 mg/kg/day, based on the trimethoprim content, is the usual initial treatment for PCP. Adverse effects of TMP-SMX develop more frequently in AIDS patients than in non-AIDS patients with PCP. The recommended dose of pentamidine isethionate for the treatment of PCP is 4 mg/kg/day, im. or i.v. A few studies have shown good response to aerosolized pentamidine. Trials of investigational agents have excluded patients with severely compromised respiratory status; eflornithine, dapsone in combination with trimethoprim, and trimetrexate have been used. Corticosteroids should be considered a last effort until additional data are available. TMP-SMX may be used to prevent recurrence of PCP or to prevent the initial occurrence of PCP in AIDS patients. Intravenous or aerosol doses of pentamidine may be effective as prophylaxis. Sulfadoxine-pyrimethamine tried as prophylaxis produced adverse reactions. Despite its higher incidence of serious adverse effects in the AIDS population, TMP-SMX is considered preferable to pentamidine for initial therapy. Pentamidine is preferred for patients with documented allergy to TMP-SMX or failure to respond to a five- to seven-day course of TMP-SMX.
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PMID:Treatment of Pneumocystis carinii pneumonia in patients with AIDS. 313 63

The toxicities of antimalarial drugs vary because of the differences in the chemical structures of these compounds. Quinine, the oldest antimalarial, has been used for 300 years. Of the 200 to 300 compounds synthesised since the first synthetic antimalarial, primaquine in 1926, 15 to 20 are currently used for malaria treatment, most of which are quinoline derivatives. Quinoline derivatives, particularly quinine and chloroquine, are highly toxic in overdose. The toxic effects are related to their quinidine-like actions on the heart and include circulatory arrest, cardiogenic shock, conduction disturbances and ventricular arrhythmias. Additional clinical features are obnubilation, coma, convulsions, respiratory depression. Blindness is a frequent complication in quinine overdose. Hypokalaemia is consistently present, although apparently self-correcting, in severe chloroquine poisoning and is a good index of severity. Recent toxicokinetic studies of quinine and chloroquine showed good correlations between dose ingested, serum concentrations and clinical features, and confirmed the inefficacy of haemodialysis, haemoperfusion and peritoneal dialysis for enhancing drug removal. The other quinoline derivatives appear to be less toxic. Amodiaquine may induce side effects such as gastrointestinal symptoms, agranulocytosis and hepatitis. The main feature of primaquine overdose is methaemoglobinaemia. No cases of mefloquine and piperaquine overdose have been reported. Overdose with quinacrine, an acridine derivative, may result in nausea, vomiting, confusion, convulsion and acute psychosis. The dehydrofolate reductase inhibitors used in malaria treatment are sulfadoxine, dapsone, proguanil (chloroguanide), trimethoprim and pyrimethamine. Most of these drugs are given in combination. Proguanil is one of the safest antimalarials. Convulsion, coma and blindness have been reported in pyrimethamine overdose. Sulfadoxine can induce Lyell and Stevens-Johnson syndromes. The main feature of dapsone poisoning is severe methaemoglobinaemia which is related to dapsone and to its metabolites. Recent toxicokinetic studies confirmed the efficacy of oral activated charcoal, haemodialysis and haemoperfusion in enhancing removal of dapsone and its metabolites. No overdose has been reported with artemesinine, a new antimalarial tested in the People's Republic of China. The general management of antimalarial overdose include gastric lavage and symptomatic treatment.(ABSTRACT TRUNCATED AT 400 WORDS)
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PMID:Clinical features and management of poisoning due to antimalarial drugs. 330 66

Mefloquine was compared with sulfadoxine-pyrimethamine for safety and efficacy in a randomized, double-blind clinical trial in adult males from a malaria-endemic area of Brazil. A total of 99 oligosymptomatic and symptomatic volunteers with Plasmodium falciparum parasitaemia took part in the trial; 49 were given 1000 mg of mefloquine and the remainder received 1500 mg of sulfadoxine plus 75 mg of pyrimethamine, in a single oral dose.Mefloquine was 100% successful in clearing parasitaemia within 7 days; there were no recrudescences. Sulfadoxine-pyrimethamine was less successful; 35 cases showed an S-type response, 8 an RI response, 3 an RII, and 2 an RIII response. The side-effects of mefloquine were mild and transient and included headache, nausea, vomiting, dizziness, and diarrhoea. A satisfactory weight gain and rise in haemoglobin level were seen in both groups.
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PMID:A phase II clinical trial of mefloquine in Brazilian male subjects. 636 Apr 1

In the tropical African environment, malaria is both a major public health problem and a problem of socioeconomic development. It is caused by various agents, the most virulent and only lethal one of which is Plasmodium falciparum. This parasite is controlled by the appropriate use of antimalarial drugs and methods of individual and collective protection. The principal drugs used to treat bouts of malaria without vomiting caused by P. falciparum are amino-4-quinoleines, essentially chloroquine. This is based on the level of resistance of P. falciparum to drugs in most African countries, particularly those of Central and West Africa. Malawi is the only country of southern Africa to have replaced chloroquine by sulfadoxine-pyrimethamine for this indication, in 1993. In cases of bouts of benign malaria with vomiting, but that are not serious, and severe malaria caused by P. falciparum (suspected or confirmed) with or without drug resistance, quinine should be given intravenously for at least three days. Once the patient regains consciouness or the digestive problems cease, quinine treatment should be given orally for 5 to 7 days. Sulfadoxine-pyrimethamine can be given as an alternative to quinine. The other antimalarial drugs currently on the African market (halofantrine, mefloquine, artemisinine and its derivatives) are often used inappropriately and should be used only in exceptional cases of severe bouts of complicated P. falciparum malaria, with suspected or confirmed resistance to amino-4-quinoleines. Individual protection against the Anopheles mosquito, the principal vector of malaria in Africa, is based largely on the use of mosquito nets impregnated with pyrethroid insecticide and the use of aerosols. Collective protection involves essentially environment-based measures.
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PMID:[Antimalarial drugs and their ways to use in the African milieu]. 1122 40

Sulfadoxine-pyrimethamine with amodiaquine (SP-AQ) is a highly efficacious regimen for intermittent preventive treatment to prevent malaria in children (IPTc), but the amodiaquine component is not always well tolerated. We determined the association between amodiaquine dosage by body weight and mild adverse events (AEs) and investigated whether alternative age-based regimens could improve dosing accuracy and tolerability, using data from two trials of IPTc in Senegal, one in which AQ dose was determined by age and the other in which it was determined by weight category. Both dosage strategies resulted in some children receiving AQ doses above the recommended therapeutic range. The odds of vomiting increased with increasing amodiaquine dosage. In one study, incidence of fever also increased with increasing dosage. Anthropometric data from 1,956 children were used to predict the dosing accuracy of existing and optimal alternative regimens. Logistic regression models describing the probability of AEs by dosage were used to predict the potential reductions in mild AEs for each regimen. Simple amendments to current AQ dosing schedules based on the child's age could substantially increase dosing accuracy and thus improve the tolerability of IPTc using SP-amodiaquine in situations where weighing the child is impractical.
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PMID:Amodiaquine dosage and tolerability for intermittent preventive treatment to prevent malaria in children. 2006 53