Typical adult doses range from 100 mg once or twice daily, with adjustments for children and special conditions. It is important to follow prescribed dosing schedules to avoid resistance and side effects. The dose is usually 2 mg per kg of body weight per day, taken as a single dose. You should take the first dose 1 or 2 days before traveling to an area where malaria may occur, and continue taking the medicine every day throughout travel and for 4 weeks after you leave the malarious area. NHS information about the medicine doxycycline, including what it's used for, who can take it, how to take it and side effects. Learn about the dosages for doxycycline tablet and capsule in treating bacterial infections. You can also find information on the drug’s strengths and how to take it. Detailed Doxycycline dosage information for adults and children. Includes dosages for Bacterial Infection, Urinary Tract Infection, Acne and more; plus renal, liver and dialysis adjustments. For adults with bacterial infections, doxycycline should be administered at 100 mg twice daily (200 mg/day), with a loading dose of 200 mg (100 mg every 12 hours) on the first day of treatment. 1 For adults, a common doxycycline dosage is 100 mg twice daily. However, doxycycline dosages vary depending on a number of factors, including age, weight, and type and severity of your condition. Doxycycline 100mg, 75mg, and 50mg are the most common strengths of capsules and tablets available. It is also available as an injection, suspension, or syrup. The standard dosage of doxycycline for most bacterial infections in adults is 100 mg twice daily, with a loading dose of 200 mg on the first day, followed by maintenance doses for durations specific to each infection type. 1 This article describes the dosages of doxycycline, as well as its strengths and how to take it. To learn more about the drug, see this in-depth doxycycline article.