Pause Reta for half marathon training

Sidney

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Aug 19, 2025
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I started taking Reta at 0.5mg/week three weeks ago. I have been training for a half marathon and increasing my long runs. Last week I ran 15k and bonked with no energy around last mile or two. I had trained for and ran a half marathon in March with no such issues. I have been bring hydration vest, drinking electrolytes before I run, eat a pbj and banana sandwich an hour or two before the run, and bring gu on my run to no avail. I am wondering if I do not have enough glucagon levels to power my long distance 1-2 hour runs and considering pausing Reta until after my race in mid-November. Thoughts?
 
That’s seems like a good call to pause it. It won’t take very long to get that low of a dose out of your system to see if it was the cause.

Worth a try to see in my feeble opinion.
 
Was training for a marathon start of this year on mounjaro was exactly the same. Bonked on longer runs and heart rate was higher. Took around 4 weeks to get back to where I was before
Debating whether to try reta at the minute as will be starting to train for tokyo from December. Just to get round not quickly as have dodgy knee
 

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