GLP-1 side effects: is day 2 always your worst day?

A weekly shot is not the same all week. The level in your blood peaks about 1 to 3 days after the shot, then slowly falls. Some people notice their rough days sit near that peak, such as days 2 and 3. Others notice nothing like it. The labels do not say whether side effects follow the peak, so this is a question your log answers for you.

Side effects can also follow a change in dose. In the studies behind the tirzepatide weight-reduction label, most nausea, vomiting and diarrhea happened while the dose was being raised. They became less common over time. The semaglutide weight-reduction label says these were reported most often while the dose was being raised.

Four things, once a day, at about the same time:

• The symptom, in your own words: nausea, heartburn, tired, headache.
• How strong it was, from 1 (barely there) to 5 (it stopped your day).
• Days since your shot. Shot day is day 0.
• Anything that changed: a new dose, a late shot, a big meal, poor sleep.

On a good day, write "none". A day with no side effects is a reading too. Without those days, a month of notes shows only the bad ones.

A notes app or a sheet of paper works. Claritide's side-effect log asks for the same things. It records the symptom, how strong it was from 1 to 5, and how long after the dose.

One bad week is a story. Three or four weeks that look alike are a pattern worth taking to your prescriber. Line your weeks up by day since the shot, then read down each day. If day 2 is the rough one week after week, that is your shot-day pattern.

Claritide checks some of this for you. Once the same symptom has been logged at least three times, it checks two things. Does it tend to come within 24 hours of a shot? Does it cluster in the week after a dose step up? It grades what it finds and calls it what it is: a pattern in your own log, not proof.

The labels tie most stomach side effects to the weeks when the dose is going up. That makes a step up a good time to keep notes. Log the week before the step, so you have something to compare with, and the two weeks after. Note the date of the step.

If a symptom starts or gets stronger after the step, bring that to your prescriber. Whether to move up, stay on a step or change anything is their call, made with you. Claritide moves through the steps your prescriber set, on the dates you entered, and never suggests a change.

Do not wait for a pattern if something feels serious. The medication guides for the semaglutide and tirzepatide weight-reduction shots say:

• Stop the medicine and call your healthcare provider right away for severe stomach pain that will not go away. It may come with or without nausea or vomiting, and may spread to your back.
• Call your healthcare provider right away for nausea, vomiting or diarrhea that does not go away. Losing fluids can lead to kidney problems.
• Call your healthcare provider for pain in your upper stomach, fever, yellow skin or eyes, or clay-colored stools.
• Stop the medicine and get medical help right away for signs of a serious allergic reaction. Signs include swelling of the face, lips, tongue or throat, and trouble breathing or swallowing. A severe rash, fainting or a very fast heartbeat count too.
• Tell your healthcare provider about a lump or swelling in your neck, hoarseness, trouble swallowing or shortness of breath.

For any other side effect that bothers you or does not go away, the guides say to talk to your healthcare provider.

Bring the pattern, not just the worst day. Note which symptoms, how strong, which days since the shot, and whether they began after a step up. Bring the good days too.

Claritide's one-page report puts your shots, side effects and injection sites on one page. You can print it or save it as a PDF.