Caffeine drug uses?

Caffeine is a stimulant with a few main medical and practical uses:

- Wakefulness and alertness: Used to reduce fatigue and improve attention, concentration, and daytime performance in some people. It’s a common nonprescription option for drowsiness or shift-work sleepiness.
- Analgesic combination products: Often combined with acetaminophen or aspirin to enhance pain relief and sometimes to speed absorption in headaches/migraine.
- Migraine headaches: Included in some prescription/OTC migraine medicines to boost effectiveness.
- Neonatal apnea of prematurity: Caffeine citrate is an approved treatment to stimulate breathing in premature infants.
- Sports and physical performance: Caffeine is used by some athletes as a legal ergogenic aid to improve endurance and perceived effort, though regulations and individual responses vary.

Forms and typical amounts (rough guide):
- Beverages: coffee about 70–140 mg per 8 oz; tea ~30–60 mg per 8 oz; cola ~30–40 mg per 12 oz.
- Tablets/capsules: common strengths include 100–200 mg per dose.
- Caffeine citrate (for neonates): dosing is determined by a clinician (loading dose around 20 mg/kg, then maintenance in the 5–10 mg/kg/day range).

Safety and who should limit caffeine:
- Avoid or limit in pregnancy (often advised ≤200 mg/day) and in people with anxiety disorders, insomnia, certain heart conditions, or uncontrolled high blood pressure.
- Can interact with some medicines (e.g., certain antibiotics like erythromycin/clarithromycin, and with other stimulants or theophylline-containing products).
- Excessive intake can cause jitteriness, sleep problems, heart palpitations, upset stomach, or headaches; withdrawal can cause fatigue and irritability.

If you’d like, tell me your context (pregnant/nursing, age, whether you’re using it for headaches, sleepiness, or another purpose), and I can tailor the information and dosing ranges more specifically.