Benadryl Syrup, Diphenhydramine/ Ammonium Chloride/ Sodium Citrate

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

Ammonium Chloride is used in the treatment of cough with the presence of mucus.

Ammonium chloride works by decreasing the stickiness of airway mucus secretions and helps in their removal of the mucus from the airways.

Some of the potential side effects of Ammonium Chloride include the symptoms below;

Facial swelling,
Allergic reaction,
Sickness,
Nausea,
Stomach pain,
Shortness of breath,
Difficulty in swallowing,
Throat disorder

Sodium Citrate is used in the treatment of cough.

Sodium citrate works to thin and loosens the mucus secretions in the nasal passageways, thus making it easier to cough out, relieving the cough.

Some of the potential side effects of Sodium citrate include the symptoms below;

Diarrhea,
Fluid loss.