Interleukin-2 (recombinant methionyl human interleukin-2 alanine 125; IL-2) was administered intralymphatically to 12 patients with advanced cancer in a phase I trial. Doses were administered once a week for 6 weeks in a dosage escalation schedule; patients were entered in four groups at successively higher starting dosages. Toxicity occurred in a profile similar to that seen with intravenous IL-2. The maximum tolerated dose with this route/schedule was 275,000 units/kg, a figure not higher than expected with intravenous administration. T1/2 alpha was prolonged to 54 min from the 13 min figure we obtained with IL-2 given intravenously. Granulocytosis and eosinophilia were seen, along with lymphocytosis following initial lymphopenia. Anti-IL-2 antibodies were seen in 42% of patients (compared to 16% with this agent given intravenously), suggesting increased immunogenicity of this route/schedule. No clinical response was achieved. Immunologic effects will be reported separately but are summarized.

Adolescent↗

PubMed1989

Recombinant human erythropoietin treatment in pre-dialysis patients. A double-blind placebo-controlled trial.

STUDY OBJECTIVE: To determine the efficacy and safety of recombinant human erythropoietin (r-HuEPO) in predialysis renal patients. DESIGN: Randomized, double-blind, placebo-controlled trial for 8 weeks. SETTING: Inpatient and outpatient facility in the Clinical Research Center of a university-based hospital. PATIENTS: Fourteen adult subjects with renal insufficiency (mean serum creatinine, 473 mumol/L +/- 61 [6.2 +/- 0.8 mg/dL]) and anemia (mean hematocrit, 0.27 +/- 0.01). INTERVENTIONS: Recombinant human erythropoietin, 50, 100, or 150 IU/kg body weight or placebo given intravenously three times per week. MEASUREMENTS AND MAIN RESULTS: Subjects who received active r-HuEPO showed a dose-dependent rise in hematocrit; mean hematocrit increased 41% from 0.27 +/- 0.01 to 0.38 +/- 0.01. At the same time, erythrocyte mass rose 43% from 13.7 +/- 0.6 mL/kg in the baseline state to 19.6 +/- 1.0 mL/kg after treatment. Maximal oxygen consumption during exercise increased 9% from 16.0 mL/min.kg +/- 1.8 to 17.5 mL/min.kg +/- 1.9. CONCLUSIONS: Recombinant human erythropoietin is effective and safe in ameliorating the anemia of pre-dialysis patients.

Adult↗

PubMed1988

Single-dose and multiple-dose pharmacokinetics of etintidine in healthy volunteers.

The present study was designed to determine the single- and multiple-dose pharmacokinetic profiles of the H2 receptor antagonist etintidine in healthy volunteers. Etintidine was rapidly absorbed and eliminated after the oral administration of 300 mg base equivalent of etintidine HCl in a capsule formulation to 11 healthy subjects. Comparison of the pharmacokinetics after a single dose and during steady state showed no significant differences (p greater than 0.05) in the mean values of Cmax, tmax, oral clearance, elimination rate constant, and renal clearance, indicating no significant accumulation of etintidine and no apparent time-dependent changes in the pharmacokinetics of etintidine during multiple dose administration.

Absorption↗

PubMed1988

The effect of food or milk on the bioavailability of etintidine in healthy subjects.

A three-way crossover study was conducted in 24 normal, male volunteers to compare the bioavailability of etintidine from capsules (2 X 200 mg) taken under fasting conditions, with food and with milk. Blood samples were collected prior to and at various times after each treatment and plasma levels of etintidine were determined by high performance liquid chromatography. Statistical analysis of the plasma etintidine concentration data indicated that while neither food nor milk had an apparent effect (p greater than 0.05) on the rate of etintidine absorption, both food alone and milk alone slightly decreased the extent of etintidine absorption. Mean bioavailability parameters of etintidine obtained following the administration of etintidine with food, milk or under fasting conditions are 5.28, 5.26 and 5.88 micrograms.h/ml, respectively (for AUC) and 1.75, 2.18 and 2.59 micrograms/ml, respectively (for Cmax), and 1.23, 1.01 and 0.91 h, respectively (for tmax). Symmetrical 95% confidence interval analyses showed that the observed decreases of less than 11% in the AUC values of etintidine following the concomitant administration of food or milk were within 17% of the fasting value and, therefore, may not be of clinical significance.

Adolescent↗

PubMed1987

Etintidine-propranolol interaction study in humans.

Etintidine HCl is a potent H2-blocker. The effect of clinical doses of etintidine on the disposition of a single oral dose of propranolol was investigated in 12 normal subjects. This was a double-blind, two-way crossover study. Each subject received etintidine (400 mg) or placebo twice a day with meals for 4 days on two occasions (separated by 4 days). On each occasion, the subjects were fasted overnight on Day 3 and were given an oral dose of Inderal (40 mg propranolol hydrochloride) 30 min following the administration of the morning dose of etintidine or placebo on Day 4. Blood samples were collected prior to and up to 24 hr following the administration of propranolol. The plasma samples were analyzed for propranolol and 4-hydroxypropranolol by HPLC. Comparison of the pharmacokinetic parameters of propranolol between etintidine and the placebo groups indicates that etintidine significantly increased the AUC0-infinity values (573.5 vs. 146.4 ng.hr/ml, p = 0.0001) and prolonged the elimination half-life (4.61 vs. 2.33 hr) of propranolol. Statistical evaluation of the pharmacokinetic parameters of 4-hydroxypropranolol indicates that etintidine also increased the AUC0-24 values (43.8 vs. 16.4 ng.hr/ml, p = 0.0028) and prolonged the elimination half-life (4.87 vs. 1.97 hr) of 4-hydroxypropranolol. The data suggest that etintidine, like cimetidine, impaired the elimination of propranolol. Etintidine also protracted the elimination of 4-hydroxypropranolol, an active metabolite of propranolol.

Adolescent↗

PubMed1980

Dependence of the chronotropic effects of calcium, magnesium and sodium on temperature and cycle length in isolated rabbit atria.

Ca (1.1--5.5 mM) acts positive chronotropic on isolated right atria of the rabbit at 38 degrees C. At 34 degrees C, the chronotropic effect was also positive but smaller than at 38 degrees C. At 30 degrees C, the chronotropic effect is variable. Negative and positive chronotrpic effects were observed. At all three temperatures, the magnitude of the effect depended on the cycle length. Mg (0.6--6.0 mM) has a negative chronotropic effect. This effect was not dependent on the cycle length. The relationship between prolongation of the cycle length and the Mg concentration turned out to be linear. The chronotropic effects of Ca and Mg were simply algebraically additive. On the average, Na (77.4--154.8 mM) has no significant chronotropic effect. However, it acts positive chronotropic on fast preparations, although it acts negative chronotropic on slow preparations. So the chronotropic effect of Na depends on the cycle length also.

Animals↗

PubMed1977

The production of dithionite and SO2 - by chemical reaction of (BI) sulphite with methyl viologen semiquinone.

Explore the source record for details and available documents.

Anaerobiosis↗

PubMedDate not supplied

Etintidine-theophylline interaction study in humans.

Etintidine HCl is a potent H2-blocker. The effect of clinical doses of etintidine on the disposition of theophylline was investigated in 10 male volunteers. This was a double-blind, two-way crossover study. Each subject received etintidine (400 mg) or placebo twice a day with meals for 4 days on two occasions (separated by 4 days). On each occasion, the subjects were fasted overnight on Day 3 and were given an oral dose of theophylline elixir (5 mg/kg) 30 min following the administration of the morning dose of etintidine or placebo on Day 4. Blood samples were collected prior to and up to 24 h following the administration of theophylline. Plasma theophylline levels were analysed by HPLC. Theophylline was rapidly absorbed following oral administration of the theophylline elixir to both the placebo and etintidine treatment groups. Comparison of the pharmacokinetic parameters of theophylline between the etintidine and the placebo groups indicates that while etintidine did not significantly (p greater than 0.05) affect the apparent Cmax (11.1 vs 10.0 micrograms ml-1) and Tmax (1.7 vs 1.4 h) values of theophylline, etintidine significantly reduced the oral clearance (0.0200 vs 0.0564 l kg-1 h-1, p = 0.000006) and prolonged the elimination half-life (16.8 vs 6.0 h) of theophylline. The data indicate that etintidine, like cimetidine, extended the elimination of theophylline in humans.

Administration, Oral↗

PubMedDate not supplied

Clinical pharmacokinetics of etintidine.

The pharmacokinetics of etintidine (E), a potent H2 blocker, were studied in 12 normal, fasted subjects. The subjects received five ascending doses of E HCl in capsules at 72-h intervals. Blood and urine samples were collected and the plasma and urine levels of E were determined by HPLC. Following oral administration, plasma E levels showed double peaks in half of the subjects. Mean Cmax (0.42, 2.11, 3.82, 4.50, and 7.15 micrograms ml-1), AUC0-infinity (0.96, 4.94, 11.3, 17.5, and 24.5 h micrograms ml-1), and the amount of E excreted unchanged in 72 h (20, 54.8, 170, 320, and 371 mg) were determined. These parameters indicate the amount of E absorbed increased linearly with dose for each individual. Renal clearance was independent of the dose and the mean value (16.6 lh-1) was about twice that of the creatinine clearance (which did not significantly change as a result of E treatment), indicating that E is actively secreted into the renal tubules. As E was eliminated rapidly from the body (t1/2 less than 2 h), no substantial accumulation of E is expected after multiple dose treatment.

Administration, Oral↗