Interactions Between Quinolone Antibiotics and Circulatory Drugs: What You Need to Know - Pharmacology

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The interaction between quinolone antibiotics and circulatory drugs?


I have poor blood circulation, and my cardiologist prescribed Pentoxifylline 400 mg to be taken three times a day.
Currently, I am also taking the antibiotic Ciprofloxacin 500 mg twice a day due to a prostate infection.
I noticed that there are warnings regarding the use of anticoagulants.
I would like to know if there are any interactions between these two medications.
If they enhance the anticoagulant effect, I will be more cautious.
My main concern is whether these medications will affect the absorption of the antibiotic.
Given the severity of the infection, I am worried about insufficient concentration leading to antibiotic resistance.
I understand that it's best to consult my outpatient physician, but since my follow-up appointments are spaced several days or even months apart, I wanted to ask here first to confirm.
So, I apologize, doctors, please don’t tell me to go back to my physician for this!

Ou Sheng, 30~39 year old female. Ask Date: 2020/11/06

Dr. Zheng Shuwen reply Pharmacology


Hello, regarding your question, here is the response: According to database inquiries, Pentoxifylline prescribed by cardiology and the antibiotic Ciprofloxacin do not interact with each other and can be taken simultaneously.
Please remember that during your medication period, in addition to carefully reading the drug label instructions, you should also pay attention to your body's reactions.
If you experience any discomfort or have further questions, feel free to consult your physician or pharmacist.
Wishing you all the best.
For inquiries, you can contact Taoyuan Rehabilitation Hospital at: 03-3698553.
Office hours: Monday to Tuesday: 08:30 AM - 09:30 PM, Wednesday to Friday: 08:30 AM, Saturday: 08:30 AM - 01:30 PM.

Reply Date: 2020/11/06

More Info


When considering the interaction between quinolone antibiotics, such as Ciprofloxacin, and circulatory drugs like Pentoxifylline, it is essential to understand the pharmacological properties and potential interactions of these medications.
Ciprofloxacin is a broad-spectrum antibiotic belonging to the fluoroquinolone class, effective against a variety of bacterial infections, including those affecting the prostate. Pentoxifylline, on the other hand, is a medication used to improve blood flow in patients with circulation problems, often prescribed for conditions like intermittent claudication and peripheral vascular disease.
Based on current medical literature and clinical guidelines, there are no significant drug interactions reported between Ciprofloxacin and Pentoxifylline. This means that taking these two medications together is generally considered safe, and they do not adversely affect each other's efficacy. Therefore, you can continue taking both medications as prescribed by your healthcare provider.

However, your concern regarding the absorption of Ciprofloxacin is valid. Certain medications can affect the absorption of antibiotics, but Pentoxifylline is not known to have this effect. Ciprofloxacin is primarily absorbed in the gastrointestinal tract, and its absorption can be influenced by the presence of divalent and trivalent metal ions (such as calcium, magnesium, and iron), which are found in some antacids and supplements. Since Pentoxifylline does not contain these ions, it should not interfere with the absorption of Ciprofloxacin.

It is also important to note your concern about the potential enhancement of anticoagulant effects. While Ciprofloxacin itself does not have anticoagulant properties, it is crucial to monitor for any signs of bleeding or unusual bruising, especially if you are on anticoagulant therapy. If you are taking any anticoagulants, such as warfarin, it is advisable to have your INR levels monitored regularly, as some antibiotics can affect the metabolism of anticoagulants.

In summary, you can safely take Ciprofloxacin and Pentoxifylline together without worrying about significant drug interactions or absorption issues. However, always remain vigilant for any side effects or unusual symptoms, and do not hesitate to reach out to your healthcare provider if you have concerns. Regular follow-ups with your physician are essential, especially when managing multiple medications, as they can provide personalized advice based on your overall health condition and treatment plan.

Lastly, while online resources can provide valuable information, they should not replace professional medical advice. If you have specific concerns or experience any adverse effects, it is always best to consult your healthcare provider directly. They can offer the most accurate guidance tailored to your individual health needs.

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