Cyproheptadine Syrup: Uses, Dosage, Side Effects & Precautions
Cyproheptadine hydrochloride syrup is a first-generation antihistamine widely prescribed for allergic conditions and as an appetite stimulant. This comprehensive guide covers its mechanism of action, clinical uses, recommended dosages, side effects, and important precautions for healthcare professionals and patients.
What is Cyproheptadine?
Cyproheptadine is a piperidine-class antihistamine that acts as a potent H1-receptor antagonist with additional antiserotonergic and anticholinergic properties. Its molecular formula is C₂₁H₂₁N·HCl with a molecular weight of 350.88 g/mol. The drug is available as 2mg/5mL syrup and 4mg tablets.
Mechanism of Action
Cyproheptadine works through multiple pharmacological pathways:
- H1-receptor blockade: Competitively blocks histamine at H1 receptors, reducing allergic symptoms like itching, sneezing, and urticaria
- Serotonin antagonism (5-HT2A): Blocks serotonin receptors, which contributes to appetite stimulation and may help in serotonin syndrome management
- Anticholinergic activity: Mild muscarinic receptor blockade contributing to drying of secretions
- Calcium channel blocking: Weak calcium channel blocking activity that may contribute to antimigraine effects
Clinical Uses of Cyproheptadine Syrup
1. Allergic Conditions
Primary indication for seasonal and perennial allergic rhinitis, allergic conjunctivitis, uncomplicated urticaria and angioedema, and dermatographic urticaria.
2. Appetite Stimulation
Widely prescribed off-label as an appetite stimulant in underweight children, patients with appetite loss due to chronic illness, anorexia nervosa (adjunctive therapy), and cancer-related cachexia.
3. Migraine Prophylaxis
Used in pediatric migraine prevention due to its antiserotonergic properties. Particularly useful in children aged 2-12 years where other prophylactic agents may not be suitable.
4. Serotonin Syndrome
Cyproheptadine is the drug of choice for serotonin syndrome treatment due to its potent 5-HT2A antagonism. Typical dose is 12mg initially followed by 2mg every 2 hours.
Recommended Dosage
| Age Group | Dose | Frequency | Max Daily Dose |
|---|---|---|---|
| Children 2-6 years | 2 mg (5 mL) | 2-3 times daily | 12 mg |
| Children 7-14 years | 4 mg (10 mL) | 2-3 times daily | 16 mg |
| Adults | 4 mg (10 mL) | 3 times daily | 32 mg |
| Elderly | 2-4 mg | 2 times daily | 16 mg |
Side Effects
Common (>10%): Drowsiness, sedation, increased appetite, weight gain, dry mouth.
Less Common (1-10%): Dizziness, headache, nausea, constipation, blurred vision, urinary retention.
Rare (<1%): Hepatotoxicity, blood dyscrasias, paradoxical CNS stimulation (especially in children), photosensitivity.
Cypro AP Syrup by Aarise Pharmaceuticals
Aarise Pharmaceuticals manufactures Cypro AP — a premium cyproheptadine hydrochloride syrup (2mg/5mL) at our WHO-GMP certified facility in Haridwar. Cypro AP features pharmaceutical-grade active ingredient, pleasant orange flavor for improved patient compliance, and rigorous quality control testing. View Cypro AP product details or contact us for bulk orders.
FAQs
Does cyproheptadine syrup increase weight?
Yes, cyproheptadine is one of the most effective appetite stimulants available. It works by blocking serotonin receptors that regulate satiety, leading to increased hunger and caloric intake. Weight gain of 1-3 kg over 4-8 weeks is commonly reported.
Can cyproheptadine be given to infants?
Cyproheptadine is generally not recommended for children under 2 years of age. For children aged 2-6, the typical dose is 2mg (5mL) two to three times daily under medical supervision.
How long does cyproheptadine take to work?
For allergic symptoms, relief typically begins within 30-60 minutes. For appetite stimulation, noticeable effects usually appear within 1-2 weeks of regular use.