Phenylephrine HCl may cause tremor (muscle shaking), restlessness, anxiety (feeling of uneasiness), insomnia/sleeplessness, nervousness, dizziness, increased blood pressure, palpitation, arrhythmia (irregular heart beat), weakness, respiratory distress (noisy, congested breathing), and pallor.
Paracetamol, when taken within the recommended dose and duration of treatment, has low incidence of undesirable effects. Skin rashes and minor stomach and intestinal disturbance have been reported.