1. Cefixime is a known weak point for enteric fever treatment

• A Cochrane systematic review of enteric fever treatment found cefixime has a longer time to defervescence (about 1.7 days longer than fluoroquinolones) and may increase relapse risk compared with ceftriaxone, azithromycin, or fluoroquinolones - Treatment of enteric fever review.
• Harrison's Principles of Internal Medicine (22nd ed.) states oral cefixime "may increase the risk of clinical failure and time to defervescence compared with fluoroquinolones," though it remains useful for multidrug-resistant strains.
• Sleisenger and Fordtran's GI/Liver Disease textbook similarly notes cefixime "may not be the best alternative therapy for uncomplicated enteric fever."
• Combining cefixime and azithromycin together is not a standard evidence-based regimen - guidelines generally recommend choosing one agent based on local resistance patterns, not layering both empirically.

2. But don't anchor on typhoid - re-open the differential

• Dengue - very important to rule out (headache, fever, retro-orbital pain are classic; antibiotics obviously won't touch it). Check CBC for platelet trend/hemoconcentration and dengue NS1 antigen/IgM.
• Malaria - peripheral smear or rapid antigen test, especially if any relevant travel/endemic exposure.
• A viral illness (e.g., non-specific viral fever) that antibiotics were never going to affect in the first place.
• Meningitis/early CNS infection - fever + headache is the classic combination to screen for this. Ask about/examine for: neck stiffness, photophobia, vomiting, altered behaviour or drowsiness, seizures, rash (petechial/purpuric), bulging fontanelle (younger children). Textbook sources (Jawetz Microbiology, Harrison's) list fever, headache, vomiting, photophobia, altered mental status as the core presentation in an older child/adolescent - these are the features that would make this urgent rather than routine.
• True treatment failure of enteric fever with a resistant strain (fluoroquinolone-resistant and even ceftriaxone-resistant Salmonella Typhi strains are increasingly reported from India and Pakistan) - recent literature (2023-2025) documents ceftriaxone-resistant pediatric isolates in north India and extensively drug-resistant typhoid clusters, so if it is typhoid, susceptibility-guided therapy matters more than empirical switching.

3. What I'd actually do at this follow-up

• First, examine for red flags (neck stiffness/Kernig-Brudzinski, altered sensorium, rash, seizures, severe dehydration, abdominal distension/tenderness suggesting perforation, bleeding manifestations). Any of these = refer/admit immediately for further workup (LP if meningitis suspected, imaging if indicated) - don't manage as outpatient.
• If no red flags, send: CBC with platelet count, blood culture (ideally before any new antibiotic), dengue NS1/IgM, malaria smear/RDT, urine routine, and consider Typhidot/TUBEX or repeat Widal (Widal alone in the first week is unreliable and shouldn't be the sole basis for continuing typhoid treatment).
• Stop assuming the diagnosis was right just because antibiotics were started - a lack of response after 5 days is itself diagnostic information telling you to investigate rather than empirically escalate.
• Pantoprazole and multivitamin are not doing any harm but also aren't relevant here and can be stopped if there's no GI indication.