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Handbook of Drug Interactions

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552 von Deutsch, Abukhalaf, and Socci<br />

Although the amphetamines and cocaine are sympathomimetic agents, they are not<br />

2-adrenoceptor agonists. Additionally, they have been used as performance enhancers<br />

and are Schedule C-II controlled substances that have been banned by both the IOC<br />

and USOC.<br />

2.5.1.1. ANDROGENS<br />

The synergistic effects <strong>of</strong> clenbuterol and anabolic steroids appear to cause myocardial<br />

infarctions, potentially resulting from coronary spasms. In laboratory animals,<br />

there is little information on the anabolic interactions taking between the -2-adrenergic<br />

agonists clenbuterol and salbutamol and the androgens. Clenbuterol had no effect<br />

on blood testosterone levels. However, treatment with dobutamine ( 1-adrenoceptor<br />

agonist) caused increases in blood testosterone levels.<br />

2.5.1.2. AMPHETAMINES<br />

Concomitant use <strong>of</strong> amphetamines with other sympathomimetics (e.g., 2-adrenoceptor<br />

agonists, cocaine, ephedrine, norepinephrine, pseudoephedrine) can cause excessive<br />

cardiovascular or CNS stimulation. Furthermore, the use <strong>of</strong> amphetamines in the<br />

presence <strong>of</strong> other sympathomimetics and cardiac glycosides (e.g., digoxin) can result<br />

in increased blood pressure, cardiac arrhythmias, and heart rate.<br />

The use <strong>of</strong> amphetamines with -adrenoceptor antagonists such as propranolol<br />

or ophthalmic -adrenoceptor antagonist solutions can produce unopposed -adrenergic<br />

activity. Through increased -adrenergic activity, an increase in blood pressure,<br />

bradycardia, or heart block could occur. Other substances that can interact with amphetamines<br />

include:<br />

Guanethidine: Causes a decrease in guanethidine’s antihypertensive effects.<br />

MAOIs: Can cause an increase in the pressor response <strong>of</strong> amphetamines through causing<br />

the release <strong>of</strong> norepinephrine.<br />

Tricyclic antidepressants: Concomitant use <strong>of</strong> tricyclics with amphetamines can decrease<br />

the effects <strong>of</strong> amphetamines.<br />

Urinary acidifiers: Concomitant use <strong>of</strong> urinary acidifiers with amphetamines decreases<br />

the half-life <strong>of</strong> amphetamines, thereby shortening the clinical effects.<br />

Urinary alkalinizers: Concomitant use <strong>of</strong> urinary alkalinizers with amphetamines increases<br />

the half-life <strong>of</strong> amphetamines, thereby prolonging the clinical effects.<br />

2.5.1.3. AMPHOTERICIN B<br />

The interaction <strong>of</strong> Amphotericin B with 2-adrenoceptor agonists such as isoproterenol<br />

can increase the risk <strong>of</strong> developing arrhythmias by causing hypokalemia and<br />

hypomagnesemia.<br />

2.5.1.4. ANTIHYPERTENSIVE AGENTS<br />

There is a potential for decreasing the effectiveness <strong>of</strong> antihypertensive therapy<br />

with concomitant use <strong>of</strong> 2-adrenoceptor agonists.<br />

2.5.1.5. CARDIAC GLYCOSIDES<br />

The risk <strong>of</strong> developing cardiac arrhythmias is significantly increased with the concomitant<br />

use <strong>of</strong> 2-adrenoceptor agonists and cardiac glycosides.

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