Final answer:
Benzathine benzylpenicillin is the Penicillin G preparation that could interfere with the heart if injected too quickly into horses. Intravenous injections require careful administration to avoid cardiac side effects.
Step-by-step explanation:
The specific Penicillin G preparation that could interfere with the heart in horses if injected too quickly is benzathine benzylpenicillin. Horse serum may be used to produce antitoxins, which can be necessary in infections by bacteria like Corynebacterium diphtheriae, which produce toxins. However, according to the American Heart Association, the administration of benzathine benzylpenicillin must be done carefully and at timely intervals to avoid risks associated with rapid injection.
Penicillin G is not stable enough to be administered orally, as it is easily inactivated by the acidic environment of the stomach, making intravenous injections necessary. During such injections, particularly with benzathine benzylpenicillin, there is a risk of inducing serious side effects, including those affecting cardiac function, if the antibiotic is administered rapidly. Thus, it is essential to follow veterinary guidelines to administer these drugs safely and effectively to horses.Penicillin G is an effective antibiotic in the treatment of various bacterial infections. However, if injected too quickly in horses, it can interfere with the heart.