Bilastine

# Bilastine ## Overview - **Classification**: Second-generation H1-antihistamine - **Mechanism**: Selective peripheral H1-receptor antagonist. Inhibits histamine-induced wheal and flare. Minimal sedative and anticholinergic effects. ## Primary Indications 1. **Allergic Rhinitis (Seasonal & Perennial)** - Symptomatic relief of sneezing, rhinorrhea, nasal itching, congestion, and ocular symptoms. 2. **Urticaria** - Symptomatic relief of pruritus and reduction of wheal size/number. ## Adult Dosing ### Standard Dosing **Allergic Rhinitis & Urticaria** - **Dose**: **20 mg** - **Frequency**: Once daily (OD) - **Route**: Oral - **Duration**: As needed for symptoms, continuous for chronic conditions. ### Dose Adjustments - **Renal Impairment**: No dose adjustment required. - **Hepatic Impairment**: No dose adjustment required. - **Elderly Patients**: No specific dose adjustment needed. ## Pediatric Dosing ### Neonates (0-28 days) - **Dose**: Not recommended/approved. - **Special Notes**: Safety and efficacy not established in this age group. ### Infants (1-12 months) - **Dose**: Not recommended/approved. - **Special Notes**: Safety and efficacy not established in this age group. ### Children (6-11 years) - **Dose**: **10 mg** - **Frequency**: Once daily (OD) - **Maximum**: **10 mg/day** - **Special Notes**: Oral solution or orally disintegrating tablet (ODT) formulations are available. Administer on an empty stomach (1 hour before or 2 hours after food/fruit juice). ### Adolescents (12-18 years) - **Dose**: **20 mg** (adult dose) - **Frequency**: Once daily (OD) - **Maximum**: **20 mg/day** ## Safety Information ### Contraindications - **Absolute**: Hypersensitivity to bilastine or any excipients. ### Common Adverse Effects - **Common (1-10%)**: Headache, somnolence, dizziness. - **Less Common (0.1-1%)**: Fatigue, thirst, dry mouth, nausea, abdominal pain. - **Serious but Rare**: Anaphylactic reaction, angioedema. ### Key Drug Interactions - **P-glycoprotein (P-gp) Inhibitors (e.g., Ketoconazole, Erythromycin, Ritonavir, Cyclosporine)**: May increase bilastine plasma concentrations. Monitor for increased adverse effects. - **Food/Fruit Juice (especially Grapefruit juice)**: Significantly reduces bilastine bioavailability. Administer on an empty stomach. - **Alcohol**: Bilastine does not potentiate alcohol-induced drowsiness. ## Monitoring & Follow-up - **Before Treatment**: No routine baseline tests required. - **During Treatment**: Monitor for symptom relief and adverse effects. - **Clinical Signs**: Watch for persistent drowsiness or unusual reactions. ## Clinical Pearls - 💡 **Tip 1**: Administer **1 hour before or 2 hours after food or fruit juice** to maximize absorption. - 💡 **Tip 2**: Generally considered **non-sedating** at recommended doses, with low potential for CNS effects. - 💡 **Tip 3**: Does not affect the ability to drive or operate machinery at therapeutic doses. - 💡 **Tip 4**: Effective for both seasonal and perennial allergic rhinitis, as well as chronic urticaria. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.