What is the primary treatment for threadworm infections?

The primary treatment for threadworm infections, also known as pinworm infections, is typically done with medications that effectively target the life cycle of the parasite. Pyrantel pamoate is recognized as a common and effective treatment for threadworm infections due to its specific action against pinworms, rendering it the preferred choice.

Albendazole is another effective medication that can be used, as it interferes with the metabolism of the worms, leading to their death. Though it can be used, it is not as widely indicated as pyrantel pamoate for initial treatment of threadworm infections.

Metronidazole is primarily used to treat bacterial and certain protozoal infections, and while it has some antiparasitic activity, it is not the first-line treatment for threadworm infections.

Ivermectin is effective for various parasitic infections but is not the primary or first-choice treatment specifically for threadworm infections. It is often reserved for situations where other treatments may be ineffective or when dealing with a broader range of parasitic infections.

Thus, while all the medications listed can have roles in treating various types of infections, pyrantel pamoate stands out as the most appropriate and common choice for threadworm infections.