Histadin Tablet is used to relieve symptoms of seasonal allergy (seasonal allergic rhinitis) and other upper respiratory tract allergies. This medicine works by restricting the action of a natural chemical (called as, histamine) which acts on the body cell sites (H1 histamine receptor). Histadin is also used to treat long-term hives.

Antihistamines

Follow directions on the product label, information guide, and provided by your doctor before using Histadin. Consume this medicine as per your doctor's instructions.

Histadin is consumed with or without food. Swallow the whole tablet of Histadin with water.

The typical adult dose of Histadin is 10 mg once daily or 2 teaspoonfuls (10 mg) of syrup once daily. The typical dose for children is 5 mg (1 teaspoonful) once daily. The maximum dose for adults of Histadin is 10 mg per day. It takes 1 to 3 hours for this medicine to start its action.

Tell your doctor if your condition persists or worsens or if you develop new symptoms. Talk to your doctor if swelling of the face, swelling of lips, swelling of the tongue, swelling of the throat, difficulty in breathing due to narrowing of the airways, shock, rash, itching, and collapse. If you have any kidney disease, an initial dose of 10 mg every other day is recommended in patients having kidney disease with clearance rate less than 30 ml/min. In children of age 2 to 5 years with kidney disease, the initial dose should be 5 mg per day. If you have issues with the health of your liver, a low initial dose of 10 mg every other day is recommended in adults and children weighing more than 30 kg or 66.1 lb. In children weighing less than 30 kg or 66.1 lb, a dose of 5 ml (5 mg) is recommended.

If you are giving Histadin Tablet to a child, be sure to use a product that is meant for use in children. Before giving this medicine, use the child's weight or age to find the right dose from the leaflet or product package. You can also read the dosage section of this page to know the correct dose for your child. Else, consult with your doctor and follow their recommendation.

If using the liquid form of this medicine, measure the dose using the provided measuring cup, spoon, or dropper. Before pouring the medicine into the measuring device, you should check the measurement markings carefully. Then, pour the dose amount into the device. After use, clean and store the measuring device in a safe place for your next use. You should not use a tablespoon or teaspoon as the dose measuring devices since it can result in an incorrect dose. If indicated on the product package, shake the medicine before use.

If using the orally-disintegrating form of this medicine, make sure you do not consume any food or fluid 5 minutes before or after taking this medicine. Before taking the medicine out of the package, wash your hands thoroughly. Place the medicine on the tongue. Make sure you do not chew or swallow the medicine. You do not need to drink water after consuming the medicine. In certain cases, the medicine can taste slightly bitter. Also, ensure that you do not break or split the medicine.

If using the rapidly-dissolving tablet form of this medicine, chew this medicine or allow the medicine to dissolve on the tongue. Next, swallow the medicine with or without water.

Medicines may be given for uses other than those listed in the medicine guide. Do not use Histadin Tablet for symptoms for which it was not prescribed. Do not give Histadin Tablet to others who may have similar symptoms as you. Self-medication can cause harm.

Store Histadin Tablet at 2-30°C (36-86°F) for tablet, 2-25°C (36-77°F) for syrup and rapidly dissolving tablet, and 20-25°C (68-77°F) for suspension and capsule, and away from moisture. Keep this medicine away from children and pets.

Read more: What are the uses of Histadin?

Before you use Histadin Tablet, tell your doctor if you are allergic to it or its ingredients. Your doctor may prescribe an alternative medicine and update your medical records to record this information.

Before you use Histadin, tell your doctor of your medical history including liver disease, or kidney disease.

Histadin Tablet should be used in pregnancy only when required. There are no adequate and well-controlled studies of Histadin has been performed in pregnant women. Histadin Tablet should be used while breastfeeding only when required. Histadin may pass into the breast milk. A choice should be made whether to discontinue the breastfeeding or to discontinue using this medicine; this decision depends on the importance of the Histadin to the mother. Consult with your doctor on the use of Histadin Tablet, if you are trying to conceive.

Histadin Tablet can make you feel sleepy. Be careful while driving, using machinery, or doing any other activity that needs you to be alert. The consumption of alcohol with Histadin Tablet can make you feel more sleepy. Histadin Tablet may cause seizures in some people. Discuss with your doctor if you perform activities where a loss of consciousness may cause you or others harm.

This medicine may increase your sensitivity to sunlight. If this happens, limit your time outdoors and do not tan to prevent sunburns. Cover your skin when you are outdoors or use a sunscreen. In case you get a sunburn, consult with your doctor.

Pregnant Women

Breastfeeding

Younger Adults Population

• fatigue
• headache
• nervousness

• allergy to sunlight
• altered salivation
• altered taste
• altered urination
• back pain
• breast enlargement
• breast pain
• chest pain
• constipation
• coughing
• decreased sexual desire (decreased libido)
• difficulty in speaking (dysphonia)
• disturbed focus
• dizziness
• dry hair
• dry mouth
• dry skin
• earache
• excess of nightmares and abnormal dreams (paroniria)
• eye pain
• fall down (collapse)
• feeling of discomfort
• feeling or being sick
• flu like symptoms (influenza-like symptoms)
• flushing
• gas formation (flatulence)
• hair loss
• hiccup
• hives
• impotence
• increased appetite
• increased sweating
• indigestion (dyspepsia)
• insomnia
• involuntary blinking of eyelids (blepharospasm)
• involuntary urination (urinary incontinence)
• irritability
• itching
• itchy inflammation of the skin (dermatitis)
• leg cramps
• loss of strength
• memory loss (amnesia)
• migraine
• muscle rigidity (hypertonia)
• muscle spasm (hyperkinesia)
• nasal dryness
• nausea
• pain in joints
• pain in muscle
• painful periods (dysmenorrhea)
• palpitations
• red or purple spots on the skin
• reduced sense of touch (hypoesthesia)
• ringing in the ear
• severe itching
• sneezing
• stomach pain (abdominal pain)
• swelling of the face
• swelling of the legs
• swelling of the lips
• swelling of the throat
• swelling of the tongue
• temporary loss of consciousness
• thirst
• tingling sensation
• tiredness
• tooth disorder
• tremor
• urinary discoloration
• vertigo
• weight gain

• diarrhea
  Consult with the doctor if such side-effects occur.
• severe allergic reaction (anaphylaxis and erythema multiforme)
  Symptoms: swelling of the lips, swelling of the face, swelling of the tongue, swelling of the throat, difficulty breathing due to narrowing of airways, shock, collapse, rash itching
  If this happens, stop taking this medicine and contact your doctor immediately.
• seizure
  If this happens, consult with your doctor.
• liver diseases (such as abnormal liver function, jaundice, liver injury and inflammation of the liver)
  If such side-effect occurs, consult with your doctor.
• heart diseases such as fast or irregular heartbeat
  If this happens, consult with your doctor.
• high blood pressure
• low blood pressure
• depression
• abnormally heavy menstrual bleeding
  If this happens, consult with your doctor.
• inflammation of the vagina (vaginitis)
  If such side-effect occurs, consult with your doctor.

Your doctor has prescribed this medicine because they judge that the benefit is greater than the risk posed by side-effects. Many people using this medicine do not have serious cases of side-effects. This page does not contain a complete list of all possible side-effects.

If you experience side-effects or notice other side-effects not listed above, contact your doctor for medical advice. You may also report side-effects to your local food and drug administration authority. You can look up the drug authority contact information from the Drug Authority Finder at TabletWise.com.

Infrequent and Rare Side-effects

• abdominal pain (stomach pain)
• alopecia (hair loss)
• altered micturition
• altered salivation
• altered taste
• amnesia
• arthralgia
• asthenia (loss of strength)
• back pain
• blepharospasm
• breast enlargement
• breast pain
• chest pain
• collapse
• constipation
• coughing
• decreased libido
• dermatitis
• dizziness
• dry hair
• dry mouth
• dry skin
• dysmenorrhea
• dyspepsia (indigestion)
• dysphonia
• earache
• eye pain
• feeling or being sick
• flatulence
• flushing
• hiccup
• hyperkinesia (muscle spasm)
• hypertonia (muscle rigidity)
• hypoesthesia (reduced sense of touch)
• impaired concentration
• impotence
• increased appetite
• increased sweating
• influenza-like symptoms
• insomnia (inability to sleep)
• irritability
• itching
• leg cramps
• malaise
• migraine
• myalgia
• nasal dryness
• nausea
• palpitations
• paresthesia
• paroniria
• peripheral edema
• photosensitivity reaction
• pruritus
• purpura
• sneezing
• swelling of the face
• swelling of the lips
• swelling of the throat
• swelling of the tongue
• syncope
• thirst
• tinnitus
• tiredness
• tooth disorder
• tremor
• urinary discoloration
• urinary incontinence
• urticaria
• vertigo
• weight gain

Severe Side-effects

• abnormal hepatic function (abnormal liver function)
• agitation
• altered lacrimation
• anaphylaxis
• angioedema
• angioneurotic edema
• anorexia
• anxiety
• blurred vision
• bronchitis
• bronchospasm
• confusion
• conjunctivitis
• depression
• diarrhea
• dyspnea
• epistaxis
• erythema multiforme
• fast heartbeat
• fever
• gastritis
• hemoptysis
• hepatic necrosis
• hepatitis
• hypertension
• hypotension
• jaundice
• laryngitis
• menorrhagia
• mucositis
• narrowing of the airways causing difficulty breathing
• pharyngitis
• rash
• rigors
• seizures
• shock
• sinusitis
• somnolence (sleepiness)
• supraventricular tachyarrhythmias (fast or irregular heartbeat)
• thrombocytopenia
• upper respiratory tract infection
• urinary retention
• vaginitis
• viral infection
• vomiting
• wheezing

Side-effects in Children

• abdominal pain
• conjunctivitis
• diarrhea
• dysphonia
• earache
• epistaxis
• fatigue
• fatigue
• hyperkinesia
• influenza-like symptoms
• malaise
• nervousness
• pharyngitis
• rash
• stomatitis
• tooth disorder
• upper respiratory tract infection
• viral infection
• wheezing

Serious Allergic Reactions

• collapse
• difficulty breathing due to narrowing of airways
• itching
• rash
• shock
• swelling of the face
• swelling of the lips
• swelling of the throat
• swelling of the tongue

If you experience side-effects or notice other side-effects not listed above, contact your doctor for medical advice. You may also report side-effects to your local food and drug administration authority. You can look up the drug authority contact information from the Drug Authority Finder at TabletWise.com.

When two or more medicines are taken together, it can change how the medicines work and increase the risk of side-effects. In medical terms, this is called as a Drug Interaction.

Histadin Tablet interacts with erythromycin, which is used to treat bacterial infection. When Histadin is used with erythromycin, the amount of Histadin increases in the blood and the amount of erythromycin decreases in the blood.

There may be an interaction of Histadin with cytochrome P450 2D6 (CYP2D6) inhibitors. When Histadin is used with CYP2D6 inhibitors, it results in an increased amount of Histadin and adverse events of Histadin.

Histadin Tablet may interact with cytochrome P450 3A4 (CYP3A4) inhibitors. When Histadin is used with CYP3A4 inhibitors, the amount of Histadin increases in the body and results in more chances of adverse events.

Your doctor's guidelines may need to be followed while taking this medicine along with ketoconazole, which is used to treat fungal infection. The amount of Histadin in the blood may increases when taken with ketoconazole.

Special instructions need to be followed while taking this medicine along with cimetidine, which is used to treat heartburn and stomach ulcers. The use of Histadin with cimetidine may increase the amount of Histadin in the blood.

This page does not contain all the possible interactions of Histadin Tablet. Share a list of all medicines that you use with your doctor and pharmacist. Do not start, stop, or change the dose of any medicines without the approval of your doctor.

Serious

• Cytochrome P450 2D6 Inhibitor
• CYP3A4 Inhibitors

Moderate

• Erythromycin
• Cimetidine
• Ketoconazole

Allergy

• severe itching
• red or purple coloured spots on the skin
• hives
• rash
• photosensitivity reaction
• swelling due to the fluid accumulation
• severe allergic reaction (anaphylaxis)

Children under the age of two years