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This medication is the brand name for Pyrantel, which belongs to a class of drugs known as anthelmintics. It works by making the worms unable to move (paralyzed) so that the body can remove them naturally in the stool. When used properly it is generally effective. In the case of treatment failure, we recommend doing stool tests (ova and parasites) to look for other possible causes. In your case, if symptoms have improved you are probably over the infection. Sometimes the infection can return so you may need to retreat in this case. Pinworms generally do not get into the urinary tract, though they may infect the urine as it passes out of the urethra. You can ask your doctor to test for this if you feel the urine is still abnormal.
A couple things. One is that an infection in the prostate gland can be very hard to eradicate and sometimes requires 3 weeks to 2 months of antibiotics. Often, the urine tests will be normal, so a doctor often has to go on clinical suspicion alone. Keep in mind that antibiotics can lead to itchy fungal infections in other places such as the penis or anus. Not sure if you considered this, but could the white material be fungal hyphae? If this were the case, it should clear within a few weeks of using an over-the-counter antifungal cream.
That's a wise approach. Hope you continue to improve.