How should an adult take doxycycline after a tick bite? - briefly
Take 100 mg doxycycline orally once daily for 10–14 days, beginning as soon as possible—ideally within 72 hours of the tick bite. Complete the full course even if symptoms improve.
How should an adult take doxycycline after a tick bite? - in detail
After a tick bite, an adult should begin doxycycline promptly to reduce the risk of Lyme disease and other tick‑borne infections. The recommended regimen is 100 mg taken orally twice daily for 21 days. The first dose should be administered as soon as possible, preferably within 72 hours of the bite, because early treatment markedly lowers the chance of disease progression.
The medication must be swallowed with a full glass of water. Taking the dose on an empty stomach enhances absorption; however, if gastrointestinal irritation occurs, a small amount of food may be taken. Avoid dairy products, antacids containing aluminum, calcium, or magnesium within two hours of each dose, as they can diminish bioavailability.
If vomiting occurs within 30 minutes of ingestion, repeat the dose. Should a dose be missed, take it as soon as remembered unless the next scheduled dose is near; then skip the missed dose and continue the regular schedule. Do not double the dose to compensate.
Potential adverse effects include mild nausea, photosensitivity, and esophageal irritation. To minimize esophageal discomfort, remain upright for at least 30 minutes after swallowing. Sun protection (clothing, sunscreen) is advisable during treatment due to increased photosensitivity.
Contraindications comprise known hypersensitivity to tetracyclines, severe hepatic impairment, and pregnancy or lactation. In such cases, alternative antibiotics (e.g., amoxicillin) should be considered.
Monitoring includes assessing for rash, severe diarrhea, or signs of an allergic reaction. If any severe adverse event arises, discontinue doxycycline and seek medical attention immediately. Completion of the full 21‑day course is essential, even if symptoms improve before the end of therapy.