Sudin D Syrup, Dextromethorphan Hydrobromide/ Diphenhydramine

Diphenhydramine is used in the treatment of allergic disorders and the symptoms it causes.

Diphenhydramine　works by blocking histamine receptors and increasing the breakdown of Diphenhydramine works by selectively inhibiting the H1 histamine receptors therefore preventing histamine from acting on its receptors Diphenhydramine helps to alleviate the symptoms caused by hay fever or other allergies (such as a runny nose and watery eyes).

Patients who take Diphenhydramine may suffer from such side effects;

Nausea,
Nervousness,
Fatigue,
Headache,
Hypersensitivity reaction,
Inability to empty the urinary bladder,
Increased energy,
Muscle twitching,
Palpitations,
Blurred vision,
Confusion,
Convulsion,
Difficulty in paying attention,
Dizziness,
Drowsiness,
Dry mouth,
Shortness of breath,
Difficulty in urination,
Eye swelling,
Lip swelling,
Restlessness,
Ringing in ear,
Sedation,
Tachycardia,
Thickened respiratory tract secretions,
Unsteadiness,
Vomiting

Dextromethorphan is used in the treatment of dry cough.

Dextromethorphan is known as a cough suppressant, Dextromethorphan works by affecting the signals in the brain that trigger cough reflex.

Some of the potential side effects of Dextromethorphan can include the symptoms below;

Sedation,
Sleepiness,
Weakness,
Dehydration,
Dizziness,
Lightheadedness,
Headache,
Sweating,
Anemia,
Fatigue,
Vomiting,
Nausea,
Edema,
Constipation,
Dry mouth.