What is Caffeine? Uses, warnings & side effects

What is Caffeine? Uses, warnings & side effects

Updated May 14, 2025 • Published Dec 30, 2020

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Caffeine overview

BRAND NAMES:

Good Neighbor Pharmacy Alert Aid, Vivarin, Good Sense Stay Awake, Health Mart Stay Awake, Keep Alert, NoDoz, Stay Awake, Sunmark Stay Awake, TopCare Stay Awake

Generic Names:

Caffeine

Uses:

Keeps you mentally alert.

Therapeutic Classes:

CNS Stimulant

Forms:

Tablet

How it’s taken:

By mouth

What is Caffeine used for?

What form(s) does Caffeine come in?

Tablet

What are common Caffeine dosages?

Bottle 16 Tablets

How to take Caffeine

Your doctor will tell you how much medicine to use. Do not use more than directed.
Follow the instructions on the medicine label if you are using this medicine without a prescription.
Read and follow the patient instructions that come with this medicine. Talk to your doctor or pharmacist if you have any questions.
Follow the instructions on the medicine label if you are using this medicine without a prescription.
Your doctor will tell you how much medicine to use. Do not use more than directed.
Read and follow the patient instructions that come with this medicine. Talk to your doctor or pharmacist if you have any questions.

What to do if you miss a dose of Caffeine

Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.
Oral routeAsk your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.
Keep all medicine out of the reach of children. Never share your medicine with anyone.

Caffeine contraindications - Who shouldn't take Caffeine?

You should not use this medicine if you have had an allergic reaction to caffeine.

Caffeine warnings

Make sure your doctor knows if you are pregnant or breast feeding.
This medicine is for occasional use only. Do not use caffeine to stay awake for long periods of time. You will still need adequate restful sleep.
Unusually fast heartbeat.

Caffeine interactions & what to avoid when taking Caffeine

Avoid foods or drinks that contain caffeine while you are using this medicine.
This medicine is for occasional use only. Do not use caffeine to stay awake for long periods of time. You will still need adequate restful sleep.

Caffeine side effects - How does Caffeine make you feel?

Serious Side Effects

Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
Ongoing drowsiness.
Unusually fast heartbeat.

Less Serious Side Effects

Trouble sleeping.
Feeling nervous or irritable.