Hello, My 5 Year Old Son Mistakenly Ate Naphthalene Ball

Hello,
My 5 year old son mistakenly ate naphthalene ball and we came to know when he got pain at night after urination.
Next day he didn't have any pain. But 4 times motion he went for in early morning. I took him to doctor and he prescribed the below:
1. Oflomac Forte 4ml 2 times for 3 days.
2. Bifilac 4ml 2 times for 3 days.
3. CUE test. We gave sample. The report yet to come.
Currently my son looks fine. No fever. No pain. After taking food and consume medicine he gone for motion. But after that no more motion.
I still have concern.
Please advice on this.

Regards,
Anil