Is Taking Doxymycin Three Times a Day Harmful? - Urology

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Hello Doctor: (Continuation of question #110847) The doctor prescribed Doxycycline (Doxymycin) for 10 tablets, and the prescription states to take one tablet in the morning and one in the evening.
However, I accidentally took three tablets in one day.
Will this cause harm to my body? Currently, I don't feel any unusual symptoms.
Thank you.

Niming, 30~39 year old female. Ask Date: 2016/09/01

Dr. Sun Hongshun reply Urology


Hello: The recommended adult dosage of this antibiotic is 200 mg per day (which is 2 tablets).
Since you have no discomfort, it is advised to increase your fluid intake to enhance metabolism.
If you still have concerns, please consult at the outpatient clinic.

Reply Date: 2016/09/01

More Info


Taking Doxymycin (also known as Doxycycline) three times a day, when the prescribed dosage is only twice a day, can potentially lead to adverse effects, although it largely depends on the individual’s health status and the specific circumstances surrounding the overdose. Doxycycline is a tetracycline antibiotic commonly used to treat various infections, including acne, respiratory tract infections, and certain sexually transmitted infections.
The standard dosage for Doxycycline in adults is typically 100 mg taken twice daily, which means that the total daily dosage would be 200 mg. If you accidentally took three doses in a day, you may have ingested a total of 300 mg, which exceeds the recommended dosage. While some individuals may not experience immediate adverse effects, it is essential to be aware of the potential risks associated with taking more than the prescribed amount.

Common side effects of Doxycycline include nausea, vomiting, diarrhea, and increased sensitivity to sunlight (photosensitivity). In some cases, higher doses can lead to more severe side effects, such as esophageal irritation or ulceration, liver toxicity, or an increased risk of developing antibiotic resistance. Additionally, long-term or excessive use of antibiotics can disrupt the natural balance of bacteria in the gut, potentially leading to conditions such as Clostridium difficile infection, which can cause severe diarrhea and colitis.

If you have taken Doxycycline three times in one day and are not experiencing any adverse symptoms, it is a positive sign. However, it is crucial to stay vigilant for any unusual symptoms that may arise. It is advisable to increase your fluid intake to help your body metabolize and eliminate the excess medication more effectively.
If you continue to have concerns about the dosage or experience any side effects, it is essential to consult with a healthcare professional. They can provide personalized advice based on your medical history and current health status. In the future, to avoid similar situations, consider using a pill organizer or setting reminders to help keep track of your medication schedule.

In summary, while taking Doxymycin three times a day may not lead to immediate harm for everyone, it is essential to monitor for any side effects and consult a healthcare provider if you have any concerns. Always adhere to the prescribed dosage and communicate with your doctor about any medication-related questions or issues.

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