--Diclofenac: Gastrointestinal discomfort, nausea, diarrhea, constipation, headache, dizziness, rash, renal impairment, hypersensitivity reactions, abdominal pain, dyspepsia, flatulence, raised liver enzymes Menthol: Allergic reactions, skin irritation, eye irritation, redness, burning sensation Methyl Salicylate: Allergic reactions, skin irritation, nausea, vomiting, tinnitus, abdominal pain, dizziness, mental confusion, sweating Please note that not all individuals will experience these side effects and they may vary from person to person. Always consult a healthcare professional for advice.