1. Avoid exposure to allergen
2. In excessive nasal secretions (Rinorrhea,sneezing,itching):

• Histazin 5mg/5ml syrup 2-5ml daily in 1 or 2 divided doses

3. In nasal obstruction:

• Decozal 0.05% spray /drop 2-3drops in each nostrils up to 3 times daily

Promethazine

Available forms:

• Histazin : 5mg/5ml syrup, 25mg tab
• Promet: 25mg tab
• Promethazine: 50mg/2ml for iv,im injection 

Therapeutic indications

• As symptomatic treatment for allergic conditions of the upper respiratory tract and skin including allergic rhinitis, urticaria and anaphylactic reactions to drugs and foreign proteins.
• As an antiemetic.
• For short term use in treatment of insomnia in adults.
• For short term use as a paediatric sedative.

The usual doses are:

25mg tablet:

• Adults  and Children>10 years : Start with 1 tablet (25 mg) taken at night. This maybe increased to a maximum of 1 tablet (25 mg) twice a dayif necessary.
• Children 5-10 years: A single tablet (25 mg) given at night. DO NOT give more than 25 mg per day.

50mg/2ml for iv,im injection 

• Adult : 25 mg; may be repeated in 2 hours when necessary; switch to PO as soon as possible
• Pediatrics≥2 years: 12.5-25 mg IM at bedtime

5mg/5ml syrup:

• 2-5 years: 5-15 mg(1-3ml) daily in 1 or 2 divided doses
• >5-10 years : 10-25(2-5ml) mg daily in 1 or 2 divided doses

Contraindications

• should not be used in patients in coma or suffering from CNS depression of any cause.
• should not be given to patients with a known hypersensitivity to any of the excipients.
• contraindicated for use in children less than two years of age because of the potential for fatal respiratory depression..

pregnancy and lactation

• should not be used in pregnancy unless the physician considers it essential.
• The use is not recommended in the 2 weeks prior to delivery in view of the risk of irritability and excitement in the neonate.
• Available evidence suggests that the amount excreted in milk is insignificant. However, there are risks of neonatal irritability and excitement.

Side effects 

• drowsiness, dizziness, restlessness, headaches, nightmares, tiredness, and disorientation. blurred vision, dry mouth and urinary retention 

Otrivine

Otrivine Nasal Spray contains the active ingredient xylometazoline hydrochloride which helps to open up and clear the nasal passages by reducing the excessive nasal secretions and returning the swollen blood vessels to their normal size.

 Used in :

• nasal congestion (blocked nose, including colds)
• allergic rhinitis
• sinusitis.
• Not used>5 days Cause rebound congestion

Pregnancy : not  recommended

Available forms:

• Otrivin 0.1% spray/drop , .05% spray /drop
• Decozal 0.1% spray/drop , .05% spray /drop
• Xylomet 0.1% spray

Dose:

Adult

• 0.1% Nasal drop 2-3 drops in each nostrils up to 3 times daily

Child>6y

• 0.05% Nasal drop 2-3 drops in each nostrils up to 3 times daily

Child 6months-6y

• 0.05% Nasal drop 1drops in each nostrils up to 3 times daily