You should use both eye drops, as they serve different, essential purposes for your recovery. Moxi D contains an antibiotic (moxifloxacin ) to prevent infection and a steroid (dexamethasone) to reduce pain and inflammation caused by the trauma. Lubrex is a lubricating drop that soothes irritation and helps the eye?s surface heal. To use them correctly, apply both as prescribed by your doctor, but ensure you wait at least 5 to 10 minutes between administering each drop so they do not wash each other out. If you experience worsening pain, vision changes, or increased redness, contact your eye specialist immediately.