Z Histamine 4 mg Tablet

Z Histamine 4 mg Tablet contains chlorpheniramine maleate, a first-generation antihistamine that can cause drowsiness. It is used to relieve allergy symptoms such as sneezing, runny nose, itchy or watery eyes, and skin itching or hives.

Z Histamine 4 mg tablet is a medicine from Ziska Pharmaceuticals Ltd. containing the generic Chlorpheniramine Maleate. It is one of the oldest and most familiar antihistamines in Bangladesh, used for decades to relieve allergy symptoms — runny nose, sneezing, itchy watery eyes, skin rashes, hives and itching — and often included in cough-cold preparations. It is inexpensive, fast-acting and effective, though it commonly causes drowsiness.

Chlorpheniramine works by blocking histamine H1 receptors. Histamine is the chemical your body releases during an allergic reaction; it makes small blood vessels leak, the nose run and the skin itch and swell. By occupying histamine's receptors, the medicine prevents these effects. Because it is a first-generation antihistamine, it also crosses into the brain, which explains both the sleepiness it causes and its usefulness at bedtime when itching disturbs sleep.

Z Histamine is used for:

• Allergic rhinitis and hay fever — sneezing, runny and itchy nose, itchy watery eyes.
• Urticaria (hives) and itchy skin conditions — including allergic rashes and reactions to foods or medicines.
• Insect bites and stings — to relieve itching and swelling.
• Common cold symptoms — drying a runny nose, often within combination remedies.
• Itching of chickenpox and other conditions — particularly at night.
• Allergic reactions — as supportive treatment under medical supervision; severe anaphylaxis always needs emergency care first.

ChamberBD shows dosing only from the approved product label, with its source named, and no label is on file for Z Histamine 4 mg Tablet. Use the dose your doctor prescribed and the instructions in the pack leaflet.

The side effects of Z Histamine mostly stem from its action on the brain:

• Drowsiness and sleepiness — very common; reaction time slows even when you feel "only slightly" sleepy. Do not drive, ride a motorcycle or operate machines after taking it.
• Dry mouth, nose and throat.
• Dizziness, poor concentration, blurred vision.
• Constipation or difficulty passing urine — more likely in older men with prostate enlargement.
• Thickened airway secretions.
• Paradoxical excitement in children — restlessness or irritability instead of sleepiness.
• Elderly people are more prone to confusion, falls and urinary retention.

Take these precautions with Z Histamine:

• No driving or machine operation after a dose — plan doses around travel and work; choose bedtime dosing where possible.
• Avoid alcohol and other sedatives — sleepiness multiplies dangerously.
• Tell your doctor if you have glaucoma, prostate enlargement or urinary difficulty, epilepsy, asthma or COPD, liver disease, or thyroid or heart problems.
• Elderly patients should use lower doses and prefer non-sedating alternatives where suitable.
• Do not combine with other cough-cold remedies that may already contain an antihistamine — risk of accidental double dosing.
• It is for short-term symptom relief; persistent allergy needs a doctor's assessment.

Interactions to know with Z Histamine:

• Alcohol — strongly increases drowsiness and impairment; avoid completely while taking it.
• Sleeping pills, anxiolytics, opioid painkillers and sedating antidepressants — additive sedation and breathing suppression risk.
• MAO-inhibitor antidepressants — intensify and prolong the drying (anticholinergic) effects; combination contraindicated.
• Other anticholinergic drugs (some antispasmodics, tricyclic antidepressants, antiparkinson drugs) — added dry mouth, constipation, urinary retention and confusion.
• Phenytoin — its level may rise.
• Other antihistamines or combination cold remedies — duplication risk.

Z Histamine should not be used in:

• Allergy to chlorpheniramine or any component.
• Newborns and premature infants — and not in children under 2 years without a doctor's order.
• Patients on MAO-inhibitor antidepressants (currently or within the last 14 days).
• Narrow-angle glaucoma.
• Urinary retention or significant prostate enlargement.
• Severe asthma attack — secretions thicken and may worsen breathing.
• Stenosing peptic ulcer or pyloroduodenal obstruction.

Pregnancy: Chlorpheniramine has decades of use and is often considered one of the preferred antihistamines when one is genuinely needed in pregnancy — but "often used" is not "use freely". Take Z Histamine in pregnancy only after consulting your doctor, at the lowest effective dose for the shortest time, and avoid it near delivery because of possible effects on the newborn.

Breastfeeding: Small amounts pass into breast milk; the drug may make the baby drowsy or irritable and can reduce milk supply, especially with repeated doses or when combined with decongestants. Prefer a non-sedating antihistamine if treatment is needed — ask your doctor. If a dose is taken, watch the baby for sleepiness or poor feeding.

Store as printed on the pack and keep out of the reach of children.