For which reason might pyrantel be preferred for treating roundworm infections?

Pyrantel is often preferred for treating roundworm infections primarily because it requires only a single dose, making it convenient for patients. This dosing regimen can enhance patient compliance, as individuals are more likely to complete a treatment that does not necessitate multiple doses over several days. The effectiveness of pyrantel as a single-dose treatment simplifies the management of the infection and reduces the burden on both the patient and healthcare providers in monitoring treatment progress.

In contrast, the other choices present various aspects that do not provide the same level of benefit. While it is true that pyrantel may have minimal side effects, stating that it has "no side effects" is misleading because all medications can potentially cause some adverse reactions. The option suggesting that it is taken twice daily does not reflect the appealing aspect of its dosing schedule, which is, in fact, a one-time administration. Lastly, the possibility of administration through injection is not relevant, as pyrantel is primarily given orally, which adds to its user-friendly profile.