So I curse myself on tier 3 with the Gran Faust's charge attack. No problem, I have a remedy capsule!
Oops, I just lost a third of my health bar, because the remedy capsule was affected by the curse, so I took damage from using it.
The entire point of remedy capsules is to counteract status effects, and they're certainly not overpowered. Taking damage from curse in order to use a remedy capsule to remove the curse is harsh and counter-intuitive.
If a vial slot is empty and then you grab a capsule it won't be cursed...