Paracetamol: Thrombocytopenia, agranulocytosis; anaphylaxis, cutaneous hypersensitivity reactions; bronchospasm, hepatic dysfunction. Caffeine anhydrous: Nervousness, anxiety, irritability, restlessness, excitability. Phenylephrine HCl: Nervousness; headache, dizziness, insomnia; increased BP; nausea, vomiting. Chlorphenamine maleate: Nervous system & cardiac disorders; allergic reactions; urinary retention; nausea, vomiting, diarrhea.