This prescription requires urgent clarification with your pediatrician. Whooping cough is typically treated with specific macrolide antibiotics. The daily tablet prescribed contains isoniazid, which is an anti-tuberculosis medicine and not the standard treatment for whooping cough. Furthermore, the combination of montelukast and levocetirizine is generally not recommended for infants under two years of age without strict specialist supervision. The multivitamin drops are safe for supportive care. Please do not panic, but do consult your pediatrician or seek a second pediatric opinion immediately before starting these medications to confirm the diagnosis and ensure the treatment plan is safe and appropriate for your baby.