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The treatment system that has emerged in the absence of quinidine is far from perfect, Travassos said.

Some people are genetically predisposed to severe adverse reactions to the heart drug quinidine and its close cousin quinine.

In laboratory experiments at the University of California, Davis, scientists fed orange-winged parrots small doses of quinidine, a potentially toxic alkaloid, and followed with what they called a “chaser” of Peruvian clay.

Dextromethorphan is a cough suppressant commonly found in over-the-counter cough medicines, and quinidine is a drug used to control heart rhythm disorders.

The medication is a combination of the cough suppressant dextromethorphan as well as quinidine, a drug that treats abnormal heart rhythms called arrhythmias.