Headache on Foundayo™

The headache row in Table 1

Section 6.1 pools Trials 1 and 2, in which adults with obesity or overweight took Foundayo™ or placebo for up to 72 weeks ^[1]. A reaction appears in Table 1 if at least 5% of treated adults reported it and it was more common than with placebo. Headache meets both conditions, but only just on the second ^[1]. The Medication Guide includes headache in its list of most common side effects ^[2].

Europe and Canada add nothing yet. The EMA committee’s opinion of 15 October 2026 is not product information and gives no frequency for headache, and Health Canada’s database has no entry for the tablet ^[3][4].

Reading a one-to-two point difference

Seven in every hundred people on placebo reported a headache at some point in the trials. On Foundayo™, the figure was eight or nine ^[1]. Put another way, most headaches in the treated groups would probably have happened without the tablet; the extra share linked to it is small. That is very different from nausea, where the tablet more than tripled the placebo rate.

Unlike abdominal pain, fatigue and hair loss, the headache row carries no footnote about related terms ^[1]. It counts headache as reported, not a wider group of similar complaints.

Trial by trial, the gap nearly closes

The registries split the pool and add a smaller trial that recorded every event. ATTAIN-1 and ATTAIN-2 list non-serious events only from 5%, and their trial doses of 6, 12 and 36 mg match the 5.5, 9 and 17.2 mg strengths ^[1][5][6]. ACHIEVE-1 tested 3, 12 and 36 mg trial doses in early type 2 diabetes, a use outside the US label ^[7].

• Only in ATTAIN-1 did headache sit clearly above placebo, by one to three points ^[5].
• In ATTAIN-2 the lowest dose matched placebo almost exactly, and in ACHIEVE-1 the middle dose did ^[6][7].
• Serious headache events were rare: one atypical migraine on 5.5 mg and one tension headache on placebo, both in ATTAIN-1 ^[5].

What the label leaves unsaid

• When headaches occurred: the label’s comment on timing covers nausea, vomiting and diarrhea, not headache ^[1].
• How severe they were: severity is only given for stomach and bowel reactions as a group ^[1].
• Whether anyone stopped because of headache: no stopping rate is given for it.
• A mechanism: the label does not attribute headache to anything the tablet does.

Routes from the tablet to a headache

Backed by label warnings, though not tested as headache causes: Foundayo™ lowers blood glucose and can cause hypoglycaemia, especially with insulin or a sulfonylurea. In the diabetes trial, 7% of people who also took a sulfonylurea had low readings, against 0.5% of those who did not ^[1]. The Medication Guide lists headache among the signs of low blood sugar, along with sweating, shakiness, hunger, a fast heartbeat and confusion ^[2].

Fluid loss is the second label route. Section 5.4 links dehydration from nausea, vomiting or diarrhea to acute kidney injury, and section 17 asks patients to avoid fluid depletion ^[1]. MedlinePlus lists headache among signs of mild to moderate dehydration and notes that feeling sick can keep you from drinking enough ^[9].

Suggested but not measured: the label says the tablet decreases food intake ^[1], and Cleveland Clinic lists skipped meals among headache triggers ^[10]. Whether eating less on orforglipron brings on headaches has not been studied, and the registries do not tie headaches to dose steps.

Headaches with nothing to do with the tablet

MedlinePlus says the most common type is tension headache, linked to tight muscles in the shoulders, neck, scalp and jaw and to stress, anxiety or depression ^[8]. Migraine is another; MedlinePlus lists caffeine withdrawal, lack of sleep, alcohol and certain foods among its triggers, and warns that regular use of pain medicine can itself cause rebound headaches ^[8]. Colds, flu, fever and premenstrual syndrome can bring headaches too ^[8].

Cleveland Clinic adds nicotine, changes in sleep, poor posture and exertion as triggers of primary headaches, and lists dehydration and medication overuse among headaches caused by something else ^[10]. Serious causes are rare, MedlinePlus says, but they include bleeding around the brain, very high blood pressure, infections such as meningitis and sleep apnoea ^[8].

What general sources say helps

MedlinePlus suggests treating a headache early: drink water to avoid dehydration, especially if you have vomited, rest in a quiet, dark room, put a cool cloth on your head and use relaxation techniques you know ^[8]. It also describes a headache diary: when the pain began, what you ate and drank the day before, how you slept, what you were doing and how long it lasted ^[8].

For a headache from fluid loss, Cleveland Clinic advises small sips rather than gulps, rest, a cold compress and avoiding drinks and headache products that contain caffeine ^[11]. For tension headaches MedlinePlus names acetaminophen, aspirin or ibuprofen ^[8]; with Foundayo™, check the choice with a pharmacist, for the reason in the next section.

Pain relievers by mouth and a slower stomach

Section 12.2 says Foundayo™ delays gastric emptying, most strongly after the first dose. Section 7.3 explains that this can affect how other medicines taken by mouth are absorbed. The label gives one measured example in section 12.3: after the first 0.8 mg dose, the peak level of acetaminophen (also called paracetamol) was 28% lower, and after repeated dosing at 17.2 mg that effect diminished ^[1].

This is a finding about absorption speed, not a statement about how well any pain reliever works. If you use pain medicines regularly, or wonder about timing them around the tablet, your pharmacist or prescriber can look at your full list; MedlinePlus also asks you to talk to your provider if you need pain medicine on three or more days a week ^[8].

Foundayo™ is a trademark of Eli Lilly and Company. PepLabo is not affiliated with or endorsed by Eli Lilly and Company.