Acid Blockers (Pantocid, Rantac) — During Chemotherapy
Most chemotherapy regimens include steroids to prevent nausea. Those steroids increase acid in your stomach, and the acid blocker in your prescription bag is there to prevent that from becoming a problem.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026
- It is a stomach protector — Pantocid and Rantac do not treat your cancer. They protect your stomach lining from the steroids given alongside chemotherapy.
- Steroids are the main reason — Dexamethasone and similar steroids given on chemotherapy days significantly increase stomach acid. Most patients need protection.
- Some interactions matter — A few targeted therapy tablets need a specific acid environment to absorb properly. Tell your team everything you take.
- Do not stop without asking — Stopping the acid blocker while steroids continue raises the risk of stomach irritation or ulcers. Always check first.
on Panel
Survival Rate*
Treated
(800+ reviews)
Pantocid (pantoprazole) and Rantac (ranitidine) are acid-blocking medicines given to protect your stomach lining during chemotherapy. Steroids and some chemotherapy drugs raise acid levels and can irritate the stomach wall. These medicines reduce that acidity. They are supportive treatment — they do not affect the cancer itself.
Why has your doctor prescribed an acid blocker with chemotherapy?
Most chemotherapy regimens include a steroid such as dexamethasone, given on treatment days to prevent nausea and allergic reactions. Steroids are effective for this, but they increase acid in the stomach. An acid blocker is given to prevent that acid from damaging the stomach lining.
Pantocid contains pantoprazole, a proton pump inhibitor that works by switching off the acid-producing cells in your stomach wall. Rantac contains ranitidine, which blocks a different chemical signal that triggers acid release. Both protect the lining; your oncologist chose the one that suits your regimen.
If you are also taking a targeted therapy tablet at home, the level of acid in your stomach affects how well that tablet is absorbed. Do not change when or whether you take the acid blocker without first asking your team.
Where to find us
Our centres in and around Hyderabad
Addressed by landmark, because that is how this city navigates. Each centre also names the areas it serves, so you can place it without a map. Consultation and day-care Chemotherapy run at every one of them.
17+ senior cancer specialists. One panel for your case.
Trained at AIIMS, Tata Memorial, and leading international centres. Combined 150+ years of experience. Every complex case is reviewed by 3+ of them — together.
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
Want a specific doctor for your case? Mention them when booking.
Book Free ConsultationBook an appointment with our specialist
Share your name and number — we'll call you back within 30 minutes to schedule your consultation.
You do not have to work this out alone
A 45-minute consultation with a specialist who treats this every week.
What should you tell your care team?
- All medicines you are currently takingInclude prescription tablets, over-the-counter antacids such as Digene or Gelusil, and anything bought for the stomach. Some of these affect how chemotherapy is absorbed.
- Any history of stomach ulcers or severe acid refluxYour team may adjust the acid blocker they choose or add further stomach protection based on your history.
- Any targeted therapy tablet you take at homeTablets such as erlotinib, gefitinib, or dasatinib need a particular acid level to absorb correctly. Your team may need to plan the timing carefully.
- New or worsening stomach pain, burning, or black stoolsThese can signal that the stomach lining is still irritated or that a bleed has occurred. Report any of these the same day.
- Any herbal or traditional medicines you use for the stomachSeveral preparations affect acid levels. Tell your team so they can check whether it is safe alongside your prescription.
- If you are thinking of stopping the acid blocker earlyStopping while you are still on steroids raises your risk of stomach irritation or ulcers. Always ask your team before stopping.
Explore 74 more Chemotherapy and Supportive Medicines by Name topics
Supportive Medicines by Name
- Acid Blockers (Pantocid, Rantac) During Chemotherapy
- Allopurinol and Tumour Lysis Prevention
- Antibiotics and Antifungals During Chemotherapy
- Aprepitant (Aprecap, Emend) for Delayed Nausea
- Ayurvedic and Herbal Medicines Alongside Chemotherapy
- Cost of Supportive Medicines Across a Course
- Dexamethasone (Dexona) During Chemotherapy
- Emeset and Ondansetron for Chemotherapy Nausea
- Erythropoietin Injections for Low Haemoglobin
- Filgrastim (Grafeel, Neukine) Injections for Low Counts
- Leucovorin: Rescue and Modulation
- Long-Acting Growth Factor (Peg-Grafeel, Neulastim)
- Loperamide (Eldoper) for Chemotherapy Diarrhoea
- Mesna: Protecting the Bladder
- Mouthwashes and Mouth Care Medicines
- Painkillers That Are Safe During Chemotherapy
- Palonosetron and Longer-Acting Anti-Emetics
- The Medicines You Go Home With After Chemotherapy
- Vitamins and Supplements During Chemotherapy
- Why You Must Not Take Paracetamol Before Checking Your Temperature
Chemotherapy Drugs by Name
- 5-Fluorouracil (5-FU, Fluracil): What to Expect
- Bleomycin (Bleocip): What to Expect
- Capecitabine (Xeloda, Capegard, Xabine): The Tablet Form
- Carboplatin (Carboplat, Kemocarb): What to Expect
- Chemotherapy Drug Classes Explained
- Chemotherapy Drug Cost by Name
- Chemotherapy Drugs: A Complete Guide by Name
- Cisplatin (Cisplan, Kemoplat): What to Expect
- Cyclophosphamide (Endoxan, Cycloxan): What to Expect
- Cytarabine (Cytosar): What to Expect
- Docetaxel (Taxotere, Docetax, Daxotel): What to Expect
- Doxorubicin (Adrim, Adriamycin): The Red Injection
- Epirubicin: What to Expect
- Etoposide (Etosid, Fytosid): What to Expect
- Gemcitabine (Gemcite, Gemtaz, Oncogem): What to Expect
- Ifosfamide (Holoxan) and Mesna: Why They Go Together
- Irinotecan (Irinotel): What to Expect
- Liposomal Doxorubicin (Lipodox, Caelyx): How It Differs
- Methotrexate (Folitrax): What to Expect
- Mitomycin, Actinomycin and Less Common Agents
- Nab-Paclitaxel (Abraxane, Nabtaxel): How It Differs
- Oxaliplatin (Oxaliplat, Dacotin): What to Expect
- Paclitaxel (Paclitax, Intaxel, Oncotaxel): What to Expect
- Pemetrexed (Alimta, Pemgem, Pemnat): What to Expect
- Reading Your Chemotherapy Chart
- Temozolomide (Temodal, Temoget): The Brain Tumour Tablet
- Vincristine (Cytocristin, Oncovin): What to Expect
- Vinorelbine (Navelbine): What to Expect
- Which Drugs Affect Fertility?
- Which Drugs Affect the Heart, Kidneys or Lungs?
- Which Drugs Cause Hair Loss and Which Do Not?
- Which Drugs Cause Nausea and How Much?
- Which Drugs Cause Neuropathy?
- Why Was This Particular Drug Chosen for Me?
Drug Interactions, TB & Chronic Medicines
Generic, Branded & Biosimilar Chemotherapy in India
- Amrit Pharmacy and Subsidised Cancer Drugs
- Biosimilars: Quality, Regulation and Price
- Can You Buy Chemotherapy Drugs Yourself?
- Cold Chain and Drug Storage: Why It Matters
- Counterfeit and Substandard Cancer Drugs
- Generic vs Branded Chemotherapy in India
- How to Check a Chemotherapy Drug Is Approved
- Is Generic Chemotherapy Safe?
- Jan Aushadhi and Government Pharmacy Options
- Patient Assistance Programmes for Cancer Drugs
- Price Control on Cancer Drugs in India
- Questions to Ask About the Drugs You Are Given
- Rituximab Biosimilars in India
- Trastuzumab Biosimilars in India
- Who Chooses the Brand Used for Your Treatment?
- Why the Same Drug Costs Ten Times More
HUB — Chemotherapy Drugs by Name
HUB — Generic, Branded and Biosimilar Chemotherapy in India
HUB — Supportive Medicines Used With Chemotherapy
Still not sure what applies to you?
Send your reports across and a senior medical oncologist will go through what they mean, what is known, and what the options actually are.
Frequently asked questions
Why am I getting an acid blocker when I have never had acidity before?
The steroids given on chemotherapy days — most commonly dexamethasone — increase stomach acid significantly, even in people who have never had acidity problems before. The acid blocker is a precaution against the steroid effect, not a treatment for a pre-existing condition. You may not notice any acidity at all if the medicine is working, which is the intended outcome.
Is Pantocid the same as Rantac? Can I use either one?
No. Pantocid contains pantoprazole, a proton pump inhibitor that switches off acid-producing cells in the stomach wall. Rantac contains ranitidine, which blocks a different signal that triggers acid release. Both protect the stomach but they work through separate mechanisms. Your oncologist chose a specific one for your regimen. Do not substitute one for the other without asking.
Will the acid blocker interfere with my chemotherapy working?
For most chemotherapy drugs, no. However, if you are also taking a targeted therapy tablet at home — such as erlotinib, gefitinib, or dasatinib — the acid level in your stomach affects how well that tablet is absorbed. Your oncologist will have accounted for this in planning your prescription. If you are unsure whether this applies to you, ask your team directly.
How long will I need to take the acid blocker?
Your team will tell you when to stop. The duration is usually tied to how long you are on steroids, which follows your chemotherapy schedule. Do not stop because the packaging runs out or because you feel well — the protection is still needed while steroids are being given. Ask your oncologist or pharmacist before making any change.
Can I skip a dose if I forget?
Tell your team rather than guessing what to do. Do not take a double dose to make up for a missed one. If forgetting is a regular problem, ask your nurse or pharmacist for a simple reminder system — attaching the medicine to an existing daily habit often helps.
Can I take antacids I already have at home alongside this prescription?
Ask your team first. Antacids such as Digene, Gelusil, or Eno work differently from pantoprazole or ranitidine. Some antacids affect the absorption of other tablets if taken at the same time. Adding something to your prescription without checking can create an interaction even if each medicine on its own appears harmless.
What side effects should I watch for from pantoprazole or ranitidine?
Most people take these medicines without noticeable effects. Occasionally, mild headache, stomach discomfort, or loose stools can occur. If you develop a skin rash, unexplained swelling, or a new symptom after starting the acid blocker, tell your team — do not assume the symptom is from the chemotherapy alone, as the source needs to be identified.
I am still getting burning and acidity even though I am taking the acid blocker. What should I do?
Tell your team. Persistent symptoms may mean the medicine needs to be reviewed, or that a different acid blocker would suit you better. Timing, certain foods, or other tablets you take can all affect how well it works. Do not increase the amount you take or add another medicine without checking first.
Chemotherapy Topics
Browse our complete chemotherapy guide — 1133 pages on side effects, medicines, cost, daily life and care in Hyderabad. Tap any topic to read more.