reactions to drugs include simple pollution, e.g. penicillin in the air of hospitals or in milk (see below), causing allergy.
Drug metabolism may also be increased by hepatic enzyme induction from insecticide accumulation, e.g. dicophane (DDT) and from alcohol and the tobacco habit, e.g. smokers require a higher dose of theophylline.
Antimicrobials used in feeds of animals for human consumption have given rise to concern in relation to the spread of resistant bacteria that may affect man.
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If you suffer with asthma, you will no doubt be familiar with the uncomfortable sensations as your bronchial tubes begin to narrow and your muscles around them start to tighten. A sticky mucus known as phlegm begins to produce and increase within your bronchial tubes and you begin to wheeze, cough and struggle to breathe.