Could my new antihistamines cause nausea?

It is unlikely that antihistamines would cause nausea, as they are not known to commonly do so. However, some individuals may be intolerant to this medication, which could result in nausea. If nausea persists, it is recommended to stop taking the antihistamine and consult with a pharmacist about alternative options such as Nasacort, Nasonex, or Flonase, which are cortisone nasal sprays known to be effective against seasonal allergies with minimal risk of causing nausea. It is important to discuss any medication interactions with your pharmacist before making any changes to your treatment plan.