L434 white pill Identifier – Tylenol PM Uses, Dosage, and Sleep Safety Tips

L434 White Pill EXPLAINED: Sleep Aid, Pain Relief, Side Effects & Full ID Guide [2025]

Medical Disclaimer: This article is for informational purposes only and should not replace professional medical advice.

What Is the L434 White Pill?

The L434 white pill is an over-the-counter medication commonly used for nighttime pain relief and sleep aid. It contains a combination of:

• Acetaminophen (500 mg) – Pain reliever and fever reducer

• Diphenhydramine HCl (25 mg) – Antihistamine with sedative properties

It’s the generic version of Tylenol PM, designed to relieve pain while helping you fall asleep faster.

Imprint: L434
Color: White
Shape: Oblong/Capsule-shaped
Drug Class: Analgesic + Antihistamine
Type: OTC (Over-the-counter)

L434 Pill Use Cases

L434 is best used at bedtime when both pain and sleep difficulty are present.

How It Works in Your Body

Acetaminophen (500 mg)

• Blocks pain signals in the brain (COX inhibition)

• Reduces fever by acting on the hypothalamus

Diphenhydramine (25 mg)

• Blocks histamine H1 receptors

• Induces drowsiness within 30–60 minutes

• Reduces allergic symptoms like sneezing or runny nose

This combination is designed only for nighttime use.

Pill Appearance and Packaging

• Oblong white tablet

• Imprint: L434 on one side

• Often sold in blister packs or generic Tylenol PM bottles

• Common in store-brand nighttime medications (e.g., CVS, Walmart, Target)

Pill ID tip: Use tools like WebMD Pill Identifier for visual validation.

Dosage Instructions

Do not exceed 2 tablets in 24 hours
Do not combine with other acetaminophen products

Warning & Safety Guidelines

DO:

• Use only before sleep

• Check other meds for acetaminophen

• Stay hydrated

DO NOT:

• Use more than 2 pills in 24 hours

• Drive or operate machinery

• Combine with alcohol

• Use if pregnant/nursing without medical approval

Overdose & Abuse Risk

• Too much acetaminophen = liver failure

• Too much diphenhydramine = confusion, hallucinations, seizures

• Chronic misuse may lead to dependence for sleep

If you suspect overdose, call Poison Control: 1-800-222-1222 (USA)

How L434 Compares to Other Pills

L434 vs L484

Many people confuse L434 with L484 due to appearance. Always read the imprint.

Sleep-Related Benefits of L434 white pill

• Helps people with pain-induced insomnia

• Shortens sleep latency (time it takes to fall asleep)

• Reduces night waking for some patients

• Can be useful for short-term sleep reset

Note: It’s not a long-term sleep aid and shouldn’t replace sleep hygiene practices.

Who Should Avoid L434 white pill?

Real User Experiences

“I use L434 after dental surgery — it knocks me out and dulls the pain.”
— Brian, 37

“It works well, but I felt groggy the next morning. Not for daytime use!”
— Monica, 42

“It’s my go-to for migraines before bed. Works better than melatonin.”
— Alex, 29

Pharmacist’s Note

“The L434 pill is a solid option for short-term pain and insomnia relief, but should never be used casually or with alcohol. Many ER visits stem from unintentional overdose from multiple acetaminophen-containing products.”
— Dr. J. Patel, PharmD, Chicago

Side Effects Breakdown

If you experience anything beyond mild symptoms, stop use and consult a physician.

Where to Buy L434 white pill

You’ll find the generic version of L434 in:

• Walmart (Equate Sleep Aid PM)

• CVS (Health PM)

• Walgreens (Nighttime Pain Reliever)

• Amazon (Kirkland Nighttime Sleep Aid)

Usually cheaper than name-brand Tylenol PM.

FAQ: L434 White Pill

Can I take L434 during the day?

No. Diphenhydramine causes drowsiness.

Can I take it with ibuprofen?

Yes, but only if no other acetaminophen is involved.

How fast does it work?

Usually within 30–60 minutes

Can I build tolerance?

Yes — especially to the diphenhydramine. Avoid nightly use beyond 2 weeks.

Drug Class & Interaction Info

Both are metabolized in the liver, so caution is required.

Final Recap: Should You Use L434 white pill?

Use L434 white pill if you need:

• Pain relief at night

• Help falling asleep

• Short-term cold or flu nighttime support

Avoid L434 if:

• You already take acetaminophen or diphenhydramine

• You need to be alert soon after use

• You’re managing chronic liver issues

Call to Action

Need help identifying your medication? → L612 White Pill vs L484 Pill EXPLAINED
Want to compare Tylenol PM vs Advil PM? → Miconazole vs Ketoconazole
Unsure if L434 is right for you? → Ask a pharmacist or consult your doctor today.