Yes, the presence of dead parasites in the stool after taking Zentel is a testament to the effectiveness of Zentel (albendazole), which disrupts the metabolism of parasites, leading to their death and elimination from the body. The strange tickling in the anal area may persist for some time, as the dead parasites and their fragments are gradually removed from the intestines, and the itching may be a remnant of the infestation.

The treatment is usually repeated after 3 weeks to destroy any new larvae or eggs that may have survived. During this time, herbal deworming preparations can be used, but their effectiveness is not as well documented as Zentel, so it is worth consulting their use with a doctor.

If your partner has trouble bowel movements, the use of senna (a laxative) should not weaken the effect of Zentel, as albendazole acts systemically against parasites and senna only facilitates bowel movements. However, it is advisable to avoid excessive use of laxatives without consulting so as not to interfere with the natural elimination of dead parasites.

If you need more personalized advice, you can use teleconsultations here:

https://www.gdziepolek.pl/telekonsultacja/

Through Gdziepolek, it is possible to book medicines in a selected pharmacy in Polish:

https://www.gdziepolek.pl/produkty/85310/zentel-tabletki-do-ssania-gryzienia-zucia/apteki

I have attached additional information that may be helpful:

https://www.gdziepolek.pl/opinie-i-pytania/66071/zentel-co-zrobic-aby-leczenie-owsikow-lekiem-zentel-bylo-skuteczne