Disclosure: Dynamo Delay makes a competing delay spray. We have not tested K-Y Duration, and we received nothing from its maker. Every product fact below comes from that product's drug facts label on DailyMed, the U.S. National Library of Medicine's label database, so you can check each one yourself.
K-Y Duration is a lidocaine delay spray. This review covers what its DailyMed label says about dose, directions, condoms and ingredients, and how those facts sit next to Dynamo Delay's label.
KY Duration Spray vs Dynamo Delay at a Glance
| Dynamo Delay | K-Y Duration | |
|---|---|---|
| Active ingredient | Lidocaine USP 13%1 | Lidocaine USP 9.6%2 |
| Lidocaine per spray | About 10 mg1 | About 10 mg2 |
| Directions | 3 or more sprays, not to exceed 10, to head and shaft before intercourse; wash off after1 | 3 or more sprays, not more than 10, to head and shaft before intercourse; wash off after2 |
| Max in 24 hours | Not stated on label1 | 20 sprays2 |
| Condoms | Not addressed on label1 | "Not compatible with condoms"2 |
| Inactive ingredients | Isopropyl palmitate, SD alcohol 40B, stearic acid (no fragrance listed)1 | Ethoxydiglycol, fragrance, isopropyl myristate, stearic acid2 |
| Size | 3/4 fl oz (22.2 mL), 270+ sprays1 | 0.16 fl oz (5 mL); 36 sprays2 |
| Made in | USA (label)1 | Taiwan (label)2 |
Labels change. Always read the label on the package you buy.
How to Use KY Duration Spray
These steps come from K-Y Duration's current DailyMed label.2
- Apply 3 or more sprays to the head and shaft of the penis before intercourse, or use as directed by a doctor.
- Don't use more than 10 sprays per application or more than 20 sprays in 24 hours.
- Wash the product off after intercourse.
- Don't use it with condoms: the label says it isn't compatible with them.
The label doesn't state a waiting time or how long the effect lasts. If you're unsure how much to use, ask a pharmacist.
Does 9.6% vs 13% Mean One Is Stronger?
No. The percentage is concentration: how much lidocaine is in the liquid. What reaches your skin depends on how much liquid each pump delivers. Both labels state about 10 mg of lidocaine per spray,1,2 so the dose per spray is the same. Your total dose depends on how many sprays you use.
The Condom Warning and Ingredients
K-Y Duration's DailyMed label states that the product "is not compatible with condoms."2 If you rely on condoms for contraception or STI protection, take that seriously. Dynamo's label doesn't make a condom-compatibility statement either way.
K-Y Duration lists ethoxydiglycol, fragrance, isopropyl myristate and stearic acid.2 Dynamo lists isopropyl palmitate, SD alcohol 40B and stearic acid.1 If you react to fragrances, compare the lists. For another label-only brand review, see our Stud 100 review.
Which One Fits You?
- K-Y Duration may suit you if you want a small travel bottle from a household brand that's easy to find in stores, and you don't plan to use it with condoms.
- Dynamo Delay Spray may suit you if you want a larger bottle (270+ sprays) and a formula with no fragrance listed on its label.
- Either way: both list about 10 mg of lidocaine per spray. Follow the label of the product you choose: 3 or more sprays, not to exceed 10.
Safety and When to See a Doctor
Don't use any lidocaine product if you or your partner are allergic to local anesthetics, or on broken or inflamed skin. Avoid the eyes. Wash the product off after sex. Using too much can cause too much numbness; use the least that works. Stop and ask a doctor if you or your partner develop a rash, burning or itching.
Delay sprays are a short-term tool, not a diagnosis. Talk to a doctor if you usually ejaculate within about a minute and it bothers you, if the problem started suddenly, if you also have erection problems, or if a spray used as directed doesn't help. The International Society for Sexual Medicine's guidelines cover the options.3 See also how to stop premature ejaculation and our best delay spray 2026 label comparison.
The Bottom Line
K-Y Duration and Dynamo Delay both list about 10 mg of lidocaine per spray. The main label differences are sprays per bottle, fragrance, K-Y's 20-spray daily limit, and K-Y's "not compatible with condoms" warning. Read the label on the package you buy.
This article was drafted with AI editorial assistance and reviewed for accuracy before publication.
