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Can I take antibiotics while on Mounjaro?

Robbie Puddick
Written by

Robbie Puddick

Medically reviewed by

Fiona Moncrieff

3 min read
Last updated February 2025
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Jump to: Understanding antibiotics with Mounjaro | Timing considerations | Managing side effects | Take home message

Yes, you can take antibiotics while on Mounjaro (tirzepatide). There are no known interactions between Mounjaro and commonly prescribed antibiotics in the UK, such as amoxicillin, clarithromycin, or flucloxacillin.

However, it’s essential to space out your medications appropriately and monitor any potential side effects.

Before starting antibiotics, always inform your GP or pharmacist about all medications you’re taking, including Mounjaro.

Both medications can affect your digestive system, so follow specific timing guidelines and eat a diet based on whole foods to minimise side effects.

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Understanding antibiotics with Mounjaro

Mounjaro works by slowing down your digestion to help you feel fuller for longer. This delayed gastric emptying can affect how quickly your body absorbs oral medications, including antibiotics.

That’s why timing is crucial when taking both medications. While no dangerous interactions are known between Mounjaro and antibiotics, proper spacing helps ensure both medications work effectively.

The importance of proper medication spacing

To maximise the effectiveness of both medications:

  • Take oral antibiotics at least 2 hours before or after your Mounjaro injection to ensure proper absorption
  • Maintain consistent timing with your antibiotic doses as prescribed by your GP
  • Keep track of your medication schedule using a diary or phone reminders
  • Consider setting alarms to help you maintain proper spacing between medications

Timing considerations for different antibiotics

Different antibiotics have varying dosing schedules. Some common UK prescriptions include:

  • Amoxicillin: Usually taken three times daily, space each dose 2 hours away from your Mounjaro injection
  • Clarithromycin: Typically taken twice daily, maintain the 2-hour spacing from Mounjaro
  • Flucloxacillin: Often prescribed four times daily, ensure proper spacing from your weekly Mounjaro dose

Managing potential side effects

Both antibiotics and Mounjaro can cause digestive side effects. Here’s how to minimise discomfort:

Focus on a diet of whole foods and hydration

Prioritise these dietary strategies while taking both medications:

  • Stay well-hydrated by drinking water throughout the day
  • Eat smaller, more frequent meals if you’re experiencing nausea
  • Eat a diet based on whole foods
  • Include probiotic-rich foods like yoghurt to support gut health
  • Limit ultra-processed or spicy foods that might irritate your stomach
  • Prioritise sleep and avoid screens half hour before bedtime

Monitor your symptoms

Contact your healthcare provider if you experience:

    • Severe or persistent diarrhoea
    • Significant nausea or vomiting
    • Unusual changes in blood sugar levels
    • Signs of an allergic reaction to either medication

Take home message

While taking antibiotics with Mounjaro is safe, careful timing and monitoring are essential.

Focus on maintaining good eating habits and staying hydrated to minimise potential side effects.

Always consult your GP or pharmacist before starting any new medication, as individual medical conditions and other medications might affect their recommendations.

Second Nature’s medication programme

Second Nature provides Mounjaro as part of our weight-loss programme.

Why should you choose Second Nature over other providers, assuming you’re eligible?

For peace of mind.

Second Nature has worked with the NHS for over 6 years, providing weight-loss programmes across the UK.

While our Mounjaro weight-loss programme is private and not currently used by the NHS, we’ve built the programme focusing on scientific evidence, patient safety, and data security.

We hope that our 6+ years of working with the NHS and building a track record of effective weight-loss results will give you peace of mind to give us a try.

Please note: We generally recommend speaking with your GP/doctor before you start taking any new medication like Mounjaro. If you do sign up for Second Nature's Mounjaro programme, then we'll also send your GP a letter to let them know you've started a medication-supported weight-loss journey.

Medication-assisted weight loss with a future focus

Start with Mounjaro, transition to habit-based health with our support

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