If you mean a **delay cream for men** (used to help delay ejaculation), these creams contain a **local anesthetic** that reduces sensitivity of the penis.

Common active ingredients:

* **Lidocaine** (typically 2.5–5%)
* **Prilocaine** (sometimes combined with lidocaine)
* **Benzocaine** (less commonly used)

How to use:

1. Apply a small amount to the head (glans) and sensitive areas of the penis about **10–20 minutes before sex** (follow the product's instructions).
2. Wipe or wash off any excess before intercourse to reduce the chance of numbing your partner.
3. Using a condom can also help prevent transfer of the anesthetic.

Benefits:

* May help delay ejaculation in men with premature ejaculation.
* Works within about **10–30 minutes**, depending on the product.

Possible side effects:

* Temporary numbness or reduced pleasure.
* Skin irritation or allergic reaction.
* Numbness in a partner if the cream is not removed or a condom is not used.

Avoid using delay creams:

* On broken or irritated skin.
* If you are allergic to local anesthetics such as lidocaine or prilocaine.

Regarding **"UD delay cream"**, I don't recognize a standard medication by that exact name. It may be a local brand. If you can share:

* the **country** you're in, or
* a **photo of the tube/box**,

I can identify the product and explain its ingredients, how to use it, and any precautions.