Caffeine + Diphenhydramine + Paracetamol + Phenylephrine is a combination of four medicines: Caffeine, Diphenhydramine, Paracetamol, and Phenylephrine, which relieves common cold symptoms. Diphenhydramine is an antiallergic that relieves allergy symptoms like runny nose, watery eyes, and sneezing.

Side Effects:
Nausea, Vomiting, Stomach pain/epigastric pain, Insomnia (difficulty in sleeping), Restlessness, Allergic reaction, Sleepiness, Dizziness, Impaired coordination, Thickened respiratory tract secretions, Headache

Precautions:
Inform your doctor if you are taking any antidepressants or medications for a cold.