Bilastine Dosing Recommendations
The recommended dose of bilastine is 20 mg once daily for adults and adolescents ≥12 years, and 10 mg once daily for children aged 2 to <12 years, with no dose adjustment required in patients with severe renal impairment. 12
Standard Dosing by Age Group
Adults and Adolescents (≥12 years)
- 20 mg once daily orally 1
- Administered as a single tablet
- Taken on an empty stomach for optimal absorption
Children (6 to <12 years)
- 10 mg once daily orally 13
- Available as orodispersible tablets
- Pharmacokinetic studies demonstrate that this pediatric dose achieves similar exposure to the adult 20 mg dose when adjusted for body weight
Young Children (2 to <6 years)
- 10 mg once daily orally 2
- Administered as orodispersible tablets
- Peak plasma concentrations occur approximately 1 hour after administration (634.91 ng/mL)
- Body weight and age do not significantly affect pharmacokinetic parameters in this age range
Special Populations
Severe Renal Impairment (eGFR <30 mL/min)
No dose adjustment is necessary 4. This is a critical distinction from other antihistamines:
- While exposure (AUC) increases approximately 2-fold in severe renal impairment compared to healthy subjects, bilastine remains well within safety margins 4
- The study demonstrated that despite increased exposure (mean AUC ranging from 737.4 ng·h/mL in healthy subjects to 1708.5 ng·h/mL in severely impaired subjects), the 20 mg daily dose was well-tolerated 4
- Renal excretion is the primary elimination route, with no alternative pathways activated even in severe renal dysfunction
- The oral plasma clearance to renal clearance ratio remains constant across all degrees of renal function
Important contrast: This differs markedly from older antihistamines like cetirizine and levocetirizine, which require dose reduction (halving) in renal impairment, or should be avoided entirely in severe cases 555
Hepatic Impairment
No dose adjustment required 1
- Bilastine does not undergo significant hepatic metabolism
- Does not interact with the CYP450 system
Elderly Patients
No dose adjustment required 16
- The lack of drug-drug interactions and favorable pharmacokinetics make bilastine particularly suitable for elderly patients
- Safe even in those with compromised hepatic or renal function
Key Clinical Advantages
Pharmacokinetic Profile:
- Rapid onset of action (peak concentration at 1 hour) 2
- Long duration of action allowing once-daily dosing
- Linear pharmacokinetics across age groups 2
- Minimal drug-drug interactions due to lack of CYP450 metabolism 1
Safety Profile:
- Non-sedating even at doses up to 80 mg once daily 6
- No anticholinergic or cardiotoxic effects 1
- Minimal central nervous system penetration
- Well-tolerated in long-term use
Common Pitfalls to Avoid
Do not reduce dose in renal impairment: Unlike cetirizine or levocetirizine, bilastine maintains its safety profile at standard doses even in severe renal dysfunction 4
Food interactions: Bilastine should be taken on an empty stomach for optimal absorption (though this is not explicitly stated in the provided evidence, it is standard practice for bilastine)
Age-appropriate formulation: Ensure children receive the orodispersible tablet formulation at the appropriate 10 mg dose, not a reduced portion of the adult tablet
Do not confuse with other antihistamines: The dosing and renal adjustment recommendations for bilastine differ significantly from older second-generation antihistamines 55