Levothyroxine
Brand: Synthroid, Levoxyl
Key warning
Boxed warning: not for obesity or weight loss; large doses can cause serious or fatal toxicity
Common side effects
- Rapid heartbeat
- Nervousness
- Insomnia
- Weight loss
- Tremor
Key interactions & cautions
- Separate from calcium and iron by 4 hours
- Antacids reduce absorption
- Take away from certain foods and fiber
- Affects warfarin blood thinner
Counseling points
- Take on an empty stomach in the morning
- Wait 30-60 minutes before eating
- Take at the same time each day
- Do not switch brands without approval
- Report chest pain or palpitations
High-yield study aid for exam prep — not a substitute for the package insert or a pharmacist’s dispensing reference.