Medical Oncologist
Starting targeted therapy
What to Expect in Your — First Month on Targeted Therapy
The first month on targeted therapy is when your body adjusts to the medicine, your team sets your baseline, and most early side effects emerge. Knowing what is coming makes it easier to manage — and to know when to call.
Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed August 2026
- Tablets at home, not a drip — Most targeted therapies are oral tablets you take on a daily schedule at home, not a clinic infusion.
- Side effects emerge early — The first four to six weeks are when most treatment-related changes appear — and when monitoring is closest.
- Dose changes are expected — Reaching your optimal dose often takes a few adjustments in the first weeks. That is part of the process, not a sign something has gone wrong.
- Response is assessed later — Your first scan is usually at around week four to eight — there is no meaningful way to judge response before that point.
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Your first month on targeted therapy is mostly about adjustment — your body learning to tolerate the medicine, your team establishing your baseline. Side effects are most likely to emerge in the first few weeks. Blood tests are more frequent, and dose changes are common. The aim is a stable, tolerable dose before your first assessment scan.
How does the first month on targeted therapy unfold?
Get baseline tests before your first dose
Blood tests taken now give your team a starting point. They usually check liver function, kidney function, a full blood count, and any markers relevant to your cancer type. Every later result is compared against these to catch any change early.
Learn exactly how and when to take your medicine
Most targeted therapies are oral tablets taken at home. Ask whether to take yours with food or on an empty stomach, what to do if you miss a dose, and which foods, vitamins or medicines to avoid. Some targeted therapies interact with grapefruit or common supplements.
Track symptoms from day one
The first week is when new symptoms are most likely to appear. A simple daily note — what you felt, when it started, whether it settled — gives your team exactly what they need. A phone note works as well as any printed diary.
Manage early side effects with your team, not on your own
Skin changes, diarrhoea, mouth soreness and tiredness are common in the first few weeks and are usually manageable. Do not treat them with over-the-counter medicines without checking first — some interact with your treatment or mask a symptom your team needs to see.
Attend your week-four review
Most teams schedule a blood test and clinical review around the end of week four. This is where your team checks your response so far, adjusts your dose if needed, and sets the date for your first assessment scan. Do not skip it, even if you feel well.
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What should I do and track in my first month?
- Save your oncology nurse's number and the after-hours line before your first dose.
- Tell your pharmacist you are on targeted therapy before adding any new medicine, vitamin or supplement.
- Note the time and dose you take each day — a phone note is enough.
- Write down any new symptom with the date it started, even if it seems minor.
- Photograph any skin change. The date stamp helps your team see whether it is worsening.
- Tell your team about any ayurvedic medicine, herbal supplement or traditional remedy you are taking.
- Check how your medicine should be stored — some targeted therapies are sensitive to heat.
- Attend every blood test appointment, including when you feel completely well.
Did you know?
For several approved targeted therapies, ESMO guidance notes that most treatment-related side effects emerge within the first four to six weeks.
This is why monitoring is most intensive during month one — not because it is the most dangerous time, but because it is when your team learns how your body is responding and makes the adjustments that shape the rest of your treatment.
Source: ESMO Clinical Practice Guidelines — Systemic Targeted Therapies
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Common questions
Frequently asked questions
How long until targeted therapy starts working?
Early signs — reduced pain, improved energy, or changes you can feel — can appear within weeks for some people, but your oncologist will not formally assess response until the first imaging scan, usually scheduled at around week four to eight. Do not read too much into how you feel day to day before that point. The scan gives your team the clearest picture of what the medicine is doing. Until then, the most useful thing you can do is track symptoms and attend your monitoring appointments.
What are the most common side effects in the first month?
The side effects you are most likely to notice depend on your specific treatment, but skin changes — dryness, rash or sensitivity — are among the most frequently reported across many targeted therapies. Diarrhoea, mouth soreness, tiredness and nausea are also common. Most are manageable when reported early. Tell your team about any new symptom, however mild — particularly skin changes, which can be treated before they become uncomfortable and which sometimes give your team useful information about how the medicine is working.
Can I take my usual medicines and supplements alongside targeted therapy?
Not without checking first. Many targeted therapies interact with common over-the-counter medicines, herbal supplements and certain foods. Grapefruit, for example, affects how the body processes several targeted agents. Your oncologist and pharmacist need a complete list of everything you are taking — prescription medicines, vitamins, ayurvedic preparations and anything else. An unrecognised interaction can reduce how well your treatment works, or make side effects more severe, and many people are unaware the risk exists.
What do I do if I miss a dose?
Ask this question before you start, not when it happens. For most oral targeted therapies, the general principle is to take the missed dose if it is still early in the day, but to skip it and continue with your next scheduled dose if that dose is soon — and never to take two doses at once to make up for a missed one. The specific rule for your medicine may differ, so ask your oncology nurse for the instructions that apply to you before your first dose.
Is it normal to feel worse before I feel better?
Some people feel more tired or notice more symptoms in the first week as their body adjusts, and that is unsettling when you expected to feel better immediately. But significant worsening — new pain, difficulty eating or drinking, or a symptom that stops you from managing daily life — is not something to wait out at home. Call your team if that is what you are experiencing. The line between normal adjustment and a symptom that needs assessment is one your team can help you draw; you do not have to judge it alone.