Feeling a vomiting sensation is not a typical side effect of Gatiquin P eye drops (Gatifloxacin and Prednisolone). This symptom may indicate a rare systemic or allergic reaction. You should stop using the drops and contact your eye doctor or surgeon immediately, especially if you experience severe eye pain, vision changes, or swelling. Your doctor will determine whether the drops are causing this reaction or if another cause is involved and adjust your treatment if needed.