What are the known side effects of Permethrin? (Hopefully not worse than Lyme Disease...)
No side effects for 2 reasons.
1 you don’t spray it on your skin, you spray it on clothes and let it dry.
2 if you do spray it on your skin your skin deactivates it within a few min.
It’s used for head lice in kid’s shampoo.
It’s a safe product.