Direct answer: Not all repellents sold in Dhaka protect your child equally, and the difference isn't small — it's the difference between roughly 6 hours of protection and under 20 minutes. Products with DEET, picaridin, or IR3535 are backed by hours-long protection data against Aedes aegypti, the dengue-carrying mosquito. Citronella and other plant-oil "natural" sprays and creams — which make up most of what's marketed to parents on Dhaka shelves — provide real but short protection, often well under an hour. Patches and wristbands, also common here, have little to no evidence of protecting a child from being bitten at all. During dengue season, what you put on your child matters as much as whether you put anything on at all.
This is part of a two-part series
This article covers what's actually on the shelf in Dhaka and how well it protects your child. A companion article covers the indoor coils, sprays, and plug-in machines many families use at home, and what those release into a child's bedroom air. Read that one here: Part 1 — What's Really in the Air.
Why protection time actually matters here
A mosquito bite that doesn't happen is a mosquito bite that can't transmit dengue. A repellent that stops working after 20 minutes is only protecting your child for that 20 minutes — the rest of the afternoon at the playground, or the evening on the balcony, your child is unprotected even though a product was applied. This is the single biggest gap between how repellents are marketed and how they actually perform.
What the evidence says about each active ingredient
Independent studies testing repellents directly against Aedes aegypti give a fairly consistent picture of protection time:
- 20% picaridin: approximately 410 minutes (about 6.8 hours)
- 20% DEET: over 380 minutes (about 6.3+ hours)
- 15% IR3535: approximately 362 minutes (about 6 hours)
- 10% IR3535: approximately 356 minutes
- 10% picaridin: approximately 351 minutes (about 5.9 hours)
- 12% N,N-diethyl-benzamide (the active ingredient in classic Odomos, chemically related to DEET): tested as comparably effective to DEET against several mosquito species, though exact Aedes-specific minutes weren't available in the studies we reviewed
- Citronella oil (sprays/creams): roughly 10–20 minutes of full protection in controlled studies, with repellency dropping from about 98% at application to under 60% by the 2-hour mark
- Patches and wristbands (citronella or other botanical-infused): in independent testing, these reduce mosquito activity only within a few centimetres of the band itself — they don't protect the rest of the body, and regulators in some markets have taken action against brands for overstating their protection claims
Mapping this to what's actually sold in Dhaka
Based on current listings from Dhaka pharmacies, baby stores, and online retailers, here's roughly where common products fall:
Likely hours of real protection (DEET / DEB-based):
Classic Odomos cream (the original formulation, found in general pharmacies rather than baby-specialty stores) uses 12% N,N-diethyl-benzamide, in the same chemical family as DEET.
Moderate, multi-hour protection (IR3535-based):
NOMOS (Beximco Pharma) uses IR3535 and is marketed with claims of several hours of protection against Aedes mosquitoes specifically.
Short protection, needs frequent reapplication (citronella / plant-oil "naturals"):
This is what most baby-marketed products in Dhaka actually are — Odomos Naturals cream and spray (citronella + vitamin E, not the same formulation as classic Odomos), Purnava spray (citronella, eucalyptus, peppermint), and Good Knight fabric roll-on. These are gentle and low-irritation, which is why they're marketed for children, but the trade-off is protection measured in minutes, not hours.
Minimal evidence of real protection (patches/wristbands):
Mamaearth mosquito patches, Tiger Balm mosquito patches, and Watsons patch products are widely available and heavily marketed for children, but this product category as a whole has the weakest independent evidence behind it.
Not found in mainstream Dhaka retail:
Picaridin — despite being one of the best-performing ingredients in the research — does not appear to have meaningful shelf presence in Dhaka yet. If you're specifically looking for it, expect to search harder or order internationally.
A practical note on reading labels: many "Odomos" products on shelves and in delivery apps right now are the Naturals line, not the original DEET-family cream. The packaging looks similar at a glance. If protection time matters for your situation — a full school day, an evening outdoors — check the ingredient list, not just the brand name.
Age limits and safe application, by ingredient
Protection time is only half the picture — the concentration and how it's applied matter just as much for a child.
- Under 2 months old: No chemical repellent is recommended at this age, regardless of ingredient — not DEET, not DEB, not IR3535, not citronella. Use mosquito nets, screened windows, and full-sleeve clothing instead.
- DEET (2 months and older): Pediatric guidance recommends the lowest effective concentration — generally 20–30% — applied sparingly. Products above 30% don't meaningfully extend protection time; they mainly increase the risk of skin irritation. There's no added benefit to reaching for a higher-percentage product "to be safe."
- DEB / classic Odomos (12% N,N-diethyl-benzamide): Follow the same sparing-application logic as DEET, since it's in the same chemical family. Check the product's own age guidance on the packaging, as formulations can vary by batch.
- Picaridin: No specific age restriction, which is part of why it's a preferred option internationally — but for children under 2, avoid applying it to the hands, since young children frequently put their hands in their mouths.
- IR3535 (as in NOMOS): Generally considered to have a good safety profile similar to DEET; follow the product's stated age guidance, and apply sparingly on children as with any repellent.
- Citronella / plant-oil "naturals": No specific age cutoff, but because these need frequent reapplication to maintain any protection, watch total exposure over a day rather than assuming "natural" means unlimited reapplication is fine.
Application rules that apply no matter which product you choose:
- Never apply repellent to a child's hands, near the eyes, or over cuts and irritated skin.
- Spray onto your own hands first, then apply to your child's face and exposed skin — don't spray directly onto their face.
- Wash repellent off with soap and water once your child is back indoors for the day.
- Skip combination sunscreen-plus-repellent products. Sunscreen needs reapplying every two hours; repellent doesn't. Combining the two leads to overexposure to the repellent ingredient.
Practical guidance by situation
- Short outdoor exposure (a walk, a quick errand): a citronella-based cream or spray is reasonable — just don't assume it lasts the whole outing.
- A full day at school, or an evening outdoors during peak mosquito hours: an IR3535 or DEET/DEB-based product, at the lowest effective concentration for your child's age, is the evidence-backed choice for actual multi-hour protection.
- Patches and wristbands: fine as a supplementary, low-effort layer, but don't rely on them as the only protection for a child in a high-transmission area during dengue season.
- Under 2 months old: skip chemical repellents entirely — nets, screens, and clothing are the only recommended protection at this age.
Frequently Asked Questions
Is "natural" or citronella-based automatically safer for my child?
It's generally gentler on skin and lower-irritation, which is a real benefit for sensitive children. But "safer" and "as protective" are different questions — citronella's protection window is much shorter, so it needs far more frequent reapplication to actually prevent bites over a few hours.
Do mosquito repellent patches or wristbands work?
Independent testing shows minimal protection beyond the immediate area of the patch itself. They're not a substitute for a cream, spray, or physical barrier like a net during high-exposure periods.
Is the Odomos on the shelf the same as the Odomos with DEET?
Not necessarily. Many Odomos products currently sold in Dhaka are the Naturals line (citronella-based), which is a different formulation from the original DEET-family cream. Check the ingredient list on the specific product you're buying.
Is picaridin available in Bangladesh?
It doesn't appear to have meaningful retail presence in Dhaka currently, despite performing well in independent studies. DEET, DEB (as in classic Odomos), and IR3535 (as in NOMOS) are more realistic options to look for locally.
What actually matters most during dengue season specifically?
Consistent, correctly-timed reapplication of a product with real evidence behind it (DEET, DEB, or IR3535) during peak mosquito activity hours — combined with physical barriers like nets and screens, which don't wear off at all.
What DEET percentage is safe for my child?
Generally 20–30% for children over 2 months old, applied sparingly. Going higher than 30% doesn't add meaningful protection time — it mainly adds irritation risk.
Can I use any repellent on a baby under 2 months?
No — this applies across every ingredient covered here, including citronella. Use mosquito nets, screens, and clothing instead until your baby is older.
Is a higher percentage always better?
No. Past roughly 30% DEET (or the equivalent for other ingredients), protection time plateaus — you're adding irritation risk without adding meaningful protection.
A note from Dr. Rafia Rashid
Dr. Rafia Rashid is a pediatrician and pediatric gastroenterologist (FCPS, Pediatrics; FCPS, Pediatric Gastroenterology & Nutrition) with over 18 years of experience, and Assistant Professor at Bangladesh Shishu Hospital & Institute. She encourages families to think of repellent choice the same way they think of any other medical product: check the active ingredient, not just the packaging.