Before beginning treatment with Nix 5% dermal cream, talk to your doctor about the following:, All the medications you take, including other topical creams, lotions, and ointments, Your allergies, Your medical history and current health problems, If you are pregnant or breastfeeding, Nix 5% dermal cream may temporarily worsen itching, swelling, and redness., Nix 5% dermal cream may cause breathing problems or an asthma attack in patients who have ragweed allergies. All the medications you take, including other topical creams, lotions, and ointments, Your allergies, Your medical history and current health problems, If you are pregnant or breastfeeding