Cromolyn sodium, a mast cell stabilizing agent, provides an immediate protective effect against the exercise-induced bronchoconstriction while being used before the exercise. However, cromolyn is ineffective in reversing asthmatic bronchospasm; it is used as a maintenance therapy and has a prophylactic role in chronic asthma.    The purpose of this study was to determine the extent of change...

A double blind, crossover study was undertaken to determine whether non-specific hyperresponsiveness in subjects with asthma was reduced by long term treatment with sodium cromoglycate and, if so, whether this was related to change in lung function. Forty four adult asthmatic subjects (41 atopic, three non-atopic) entered the one year study at intervals staggered over six months. After a baseli...

The output of the drug and the particle size produced by various nebulisers were assessed, and sensible nebulisation times for sodium cromoglycate calculated. Three of the four nebuliser systems tested produced over 80% of total drug output within the first five minutes of nebulisation. We suggest that five minutes is an optimum nebulisation time for sodium cromoglycate using these nebuliser co...

The inhibition of immediate allergen or histamine induced airflow obstruction by inhaled ketotifen, clemastine, sodium cromoglycate, and placebo was studied in two groups of asthmatic subjects. Single doses of ketotifen (0.5 mg), clemastine (0.5 mg), sodium cromoglycate (20 mg), or placebo were administered by inhalation 45 minutes before bronchial provocation testing at weekly intervals, doubl...

The substituted chromone carboxylic acid FPL 52694 inhibited models of IgE-mediated immediate hypersensitivity reactions in the rat by a mechanism similar to that of sodium cromoglycate. The compound was more potent than sodium cromoglycate but unlike cromoglycate was active following oral administration. Correspondence to: Dr. R.P. Eady, Fisons Pharmaceutical Division, Bakewell Road, Loughboro...

The substituted chromone carboxylic acid FPL 52694 inhibited models of IgE-mediated immediate hypersensitivity reactions in the rat by a mechanism similar to that of sodium cromoglycate. The compound was more potent than sodium cromoglycate but unlike cromoglycate was active following oral administration. Correspondence to: Dr. R.P. Eady, Fisons Pharmaceutical Division, Bakewell Road, Loughboro...

Ketotifen (Zaditen), a benzocycloheptathiophene derivative, is a new oral agent for treating asthma, with action similar in some respects to that of sodium cromoglycate. It is well established that sodium cromoglycate protects against antigen challenge by inhibiting the release of chemical mediators from mast cells. It also inhibits exerciseinduced bronchoconstriction and has bronchodilator pro...

Inhalation treatment may be less effective in the presence of bronchoconstriction because of the reduced penetration of drugs into the airways. The effect of bronchoconstriction on the lung deposition and plasma pharmacokinetics of inhaled sodium cromoglycate was examined. Ten subjects attended the laboratory on three occasions. On the first occasion a bronchial provocation test was performed t...