Foundayo Dosing Schedule: Complete Titration Guide (0.8mg to 17.2mg)

Foundayo (orforglipron) uses a gradual titration schedule to minimize side effects and allow your body to adjust to each dose level before increasing. The approved dosing range runs from 0.8mg up to a maximum of 17.2mg daily, but not every patient needs to reach the highest dose. Understanding how titration works, what to expect at each level, and when to stay put or stop is essential for a successful treatment course.

Quick Answer

Foundayo titration starts at 0.8mg daily for 4 weeks, then increases to 2.5mg, then 5.5mg. From there, dose increases to 9mg, 14.5mg, and 17.2mg are optional and guided by clinical response and tolerability. If you miss 7 or more consecutive doses, you need to restart at a lower dose. Patients on strong CYP3A4 inhibitors should not exceed 9mg.

Full Titration Schedule

The following table outlines the standard Foundayo titration timeline based on prescribing information:

Dose	Weeks	Purpose	Approx. Self-Pay Cost
0.8mg	Weeks 1–4	Tolerability phase. Build GI tolerance. Minimal weight loss expected.	$149/mo
2.5mg	Weeks 5–8	Appetite reduction becomes noticeable. Mild nausea may recur briefly.	$199/mo
5.5mg	Weeks 9–12	First therapeutic dose. Weight loss typically accelerates. Side effects often stabilize.	$299/mo
9mg	Weeks 13–16 (optional)	Increased efficacy. Max dose if on a CYP3A4 inhibitor.	$349/mo
14.5mg	Weeks 17–20 (optional)	Higher efficacy for patients who need additional weight loss.	$349/mo
17.2mg	Week 21+ (maximum)	Maximum approved dose. Not required for all patients.	$349/mo

What to Expect at Each Dose Level

Side effects follow a predictable pattern during titration: they tend to peak in the first 1–2 weeks after each dose increase, then gradually improve as your body adjusts.

• 0.8mg: Most patients notice little change beyond mild nausea or reduced appetite. This dose is primarily about building tolerance, not losing weight.
• 2.5mg: Appetite suppression becomes more obvious. Some patients report early satiety — feeling full after smaller meals. Nausea may briefly recur after the increase.
• 5.5mg: This is generally considered the first fully therapeutic dose. Weight loss typically becomes measurable. GI side effects often begin to stabilize. In ATTAIN-1, the 5.5mg group showed clinically meaningful weight reduction.
• 9mg–17.2mg: Higher doses produce greater weight loss on average, but not every patient needs or tolerates the maximum. The decision to continue titrating depends on balancing efficacy against side effects.

For a detailed week-by-week side effect breakdown, see our Foundayo side effects guide.

Missed Dose Rules

Foundayo is taken once daily, and consistency matters. Here is what to do if you miss a dose:

• Missed same day: Take the dose as soon as you remember, as long as it is the same calendar day.
• Do not double up: Never take two doses in one day to make up for a missed dose.
• Missed 1–6 consecutive days: Resume at your current dose. Expect mild GI symptoms to briefly recur as your body readjusts.
• Missed 7 or more consecutive days: Restart at 0.8mg and follow the titration schedule again. Jumping back to a higher dose after an extended gap significantly increases the risk of severe nausea and vomiting.

Setting a daily alarm or keeping your Foundayo next to something you do every morning (like brushing your teeth) reduces missed-dose risk.

CYP3A4 Inhibitor Interaction: 9mg Cap

Foundayo is metabolized partly through the CYP3A4 enzyme pathway. If you take a strong CYP3A4 inhibitor, blood levels of orforglipron can rise significantly, increasing side effect risk. Patients on strong CYP3A4 inhibitors should not exceed 9mg daily.

Common strong CYP3A4 inhibitors include:

• Ketoconazole and itraconazole (antifungals)
• Clarithromycin (antibiotic)
• Ritonavir and cobicistat (HIV medications)
• Grapefruit juice in large quantities

Always share your full medication list with your prescriber before starting Foundayo. For the complete interaction profile, see our Foundayo drug interactions guide.

Cost Per Dose Tier

Foundayo self-pay pricing through LillyDirect varies by dose level:

• 0.8mg: $149/month
• 2.5mg: $199/month
• 5.5mg: $299/month
• 9mg, 14.5mg, and 17.2mg: $349/month

With commercial insurance and the Lilly Savings Card, the copay can drop to as low as $25/month regardless of dose. For the full cost breakdown, see our Foundayo cost and pricing guide.

When to Stop Increasing Your Dose

Not everyone needs to reach 17.2mg. Consider staying at your current dose when:

• You are losing weight at a steady, clinically meaningful rate (typically 1–2 lbs per week)
• Your side effects are manageable and you feel well
• Your A1C or metabolic markers are improving (for patients with type 2 diabetes)
• Your prescriber recommends holding based on your individual response

The right maintenance dose is the one that balances good results with tolerable side effects over the long term. Chasing the maximum dose when a lower dose is already working well is rarely necessary and may reduce quality of life without meaningful additional benefit.

Bottom Line

Foundayo titration is a 12–20+ week process designed to build tolerance gradually. Follow the schedule, do not skip ahead, and communicate with your prescriber about how you are responding at each level. If side effects are severe at any dose, it is better to slow down or step back than to push through and risk discontinuation. The best dose is the one you can take consistently while getting good results.

Sources

1. Foundayo (orforglipron) prescribing information, Eli Lilly, April 2026.
2. ATTAIN-1 clinical trial: dose-response data for orforglipron in weight management.
3. FDA drug interaction guidance for CYP3A4 substrates.