Skip to content
Dr. Hall’s Notes

Topic

Safety

11 pieces in this topic.

Taking a GLP-1 After 65

Safety

Taking a GLP-1 After 65

The benefits are real and so is a risk that gets almost no attention: an older adult who loses 15% of their weight without a protein and training plan can arrive lighter, healthier on paper, and unable to get off the floor.

Apr 20265 min
Who Should Not Take a GLP-1

Safety

Who Should Not Take a GLP-1

The contraindications are short, specific, and frequently skipped by a ten-minute online intake. The cautions are longer and more interesting. A screening guide written the way I would run it in clinic.

Apr 20266 min
GLP-1s, Surgery, and Procedures

Safety

GLP-1s, Surgery, and Procedures

A stomach that empties slowly can still hold food after a standard overnight fast, which is a problem under anaesthesia. The guidance has moved on from 'stop the drug' — but the instruction to you has not changed at all.

Feb 20265 min
GLP-1s for Teenagers

Safety

GLP-1s for Teenagers

Semaglutide is licensed from age twelve, the trial result was larger than in adults, and almost every conversation I have with parents about it is really a conversation about something else.

Feb 20264 min
GLP-1s and Gastroparesis

Safety

GLP-1s and Gastroparesis

Every one of these drugs delays gastric emptying — that is the mechanism, not a malfunction. The question worth answering is where the line sits between the intended effect and a condition you would not want.

Jan 20264 min
Hypoglycemia on a GLP-1

Safety

Hypoglycemia on a GLP-1

These drugs almost never cause a low on their own. Add insulin or a sulfonylurea and a much smaller plate, and they do — and the symptoms look enough like a dozen other things that people treat the wrong problem.

Jan 20265 min
GLP-1s and Your Other Medications

Safety

GLP-1s and Your Other Medications

A stomach that empties slowly changes how every pill you swallow is absorbed. Most of the time that does not matter. Here is the list of times it does — starting with the one on the tirzepatide label that almost nobody has read.

Dec 20254 min
GLP-1s and Cancer Risk

Safety

GLP-1s and Cancer Risk

Two things are true and they point in opposite directions: obesity is a well-established cause of at least thirteen cancers, and these drugs carry a warning derived from tumours in rats. Here is how to hold both.

Dec 20254 min
The Thyroid Cancer Warning, Explained

Safety

The Thyroid Cancer Warning, Explained

Every one of these drugs carries a boxed warning about thyroid tumours, and it comes from rats. Whether it means anything for humans is a genuinely open question — here is what is known, what is not, and what to do with that.

Dec 20255 min
GLP-1s and Your Gallbladder

Safety

GLP-1s and Your Gallbladder

Rapid weight loss makes gallstones. That was true long before these drugs existed, and it is the mechanism behind most of the gallbladder trouble people blame on the medication itself.

Nov 20255 min
The Pancreatitis Warning, Explained

Safety

The Pancreatitis Warning, Explained

It appears in the warnings for every drug in this class and as a red flag on every page of this site. Here is what the evidence actually shows, and the one pattern of pain that should never wait until morning.

Nov 20254 min