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Carboplatin + pemetrexed + Keytruda: what to expect

If Carboplatin + pemetrexed + Keytruda is part of your plan, it's normal to wonder what the days ahead will look like for you and your family. Here's a plain-language look at the schedule, the side effects and how to take care of yourself along the way.

ℹ️ General information to help you and your loved ones talk with your care team, not medical advice. Read our disclaimer.

Used for: Lung cancer

The quick guide

Drugs in it: Carboplatin, Alimta (pemetrexed), Keytruda (pembrolizumab).

Typical schedule: Usually every 3 weeks for 4 cycles, then pemetrexed and Keytruda continue as maintenance. You'll take folic acid and get vitamin B12 shots to make pemetrexed safer.

What to expect: You can get chemo side effects (tiredness, nausea, low blood counts) plus immune side effects from Keytruda. Report diarrhea, cough or rash early.

Your exact schedule and number of cycles are set by your oncologist and may differ from what's described here.

Side effects you may notice

Call your care team now if you have:

Fever of 100.4°F (38°C) or higher, or chills (possible infection when blood counts are low)
Vomiting or diarrhea that won't stop, or you can't keep fluids down
Unusual bleeding or bruising
Shortness of breath or chest pain
Signs of an allergic reaction during or after an infusion: trouble breathing, swelling of the face or throat, hives

Call 911 for trouble breathing, chest pain or signs of stroke.

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❓ Questions you and your loved ones can ask

What is the goal of this treatment for me?
How will we know if it's working?
Which side effects should I call about right away, and what number do I call after hours?
Which medicines, vitamins or supplements should I avoid?
Will this affect my ability to work, drive or care for my family?
What will this cost me, and who can help me with coverage?
How many cycles will I get, and what happens after?

Help paying for treatment

See each drug page for programs, or the independent foundations. Infused chemo is usually covered by Medicare Part B; see Medicare and your cancer drugs.

PAN Foundation: Copay grants for insured people, including those on Medicare, who meet income limits, when a fund for their diagnosis is open.
FundFinder (from PAN): A free tool that tracks when copay foundation funds open and can send you an alert, so you don't have to keep checking each site.
HealthWell Foundation: Grants for copays, deductibles, and premiums for insured people under income limits; the disease funds page shows which are open.
CancerCare Co-Payment Assistance Foundation: Help with treatment copays for insured people with certain cancers who meet income limits.
Patient Advocate Foundation Co-Pay Relief (TotalAssist): Copay and coinsurance help for insured patients who qualify by income, from the Patient Advocate Foundation.
Good Days: Copay help, and in some funds travel costs, for insured people with chronic or life-changing illnesses who meet income limits.
Accessia Health (formerly Patient Services, Inc.): Help with premiums, copays, and travel for people with certain chronic and rare conditions.
The Assistance Fund: Copay, premium, and other cost help for insured people with serious illnesses, when a disease fund is open.
NORD Patient Assistance Programs: Cost help for people with certain rare diseases, including some rare cancers.
NeedyMeds: A free, open-to-anyone database of drug-maker programs, foundations, and low-cost clinics, plus a drug discount card.

Funds open and close often. FundFinder shows which are open now. See more help on paying for cancer treatment.

Questions people often ask

What is maintenance therapy?

After the first cycles, some drugs continue to help keep the cancer under control.

Written by the Cancer Side Effects Guide team from FDA labels and leading cancer centers. Not medical advice. · Last updated: October 15, 2026 · How we write

Not medical advice. This page is general information to help you talk with your care team. It can't replace advice from your doctor or nurse. If you have a fever of 100.4°F (38°C) or higher during treatment, or any symptom that worries you, call your care team now. In an emergency, call 911.

Sources

Last updated: October 15, 2026. We summarize these sources in our own words.