Pao Pereira + Calcium Carbonate
Calcium Carbonate brand names: Tums, Os-Cal, Adcal, Calcichew, Adcal-D3.
We found no known interaction between Pao Pereira and Calcium Carbonate in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first.
Pao Pereira and Calcium Carbonate
We checked these two against our interaction database. Here is what we found.
No Known Interaction Found
We did not find a documented interaction between Calcium Carbonate and Pao Pereira in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.
Worth understanding: our licensed dataset holds no drug-interaction record for Pao Pereira at all — not against Calcium Carbonate, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.
If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.
Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.
Pao Pereira safety at a glance
Safety guidance is general; always confirm with your pharmacist or doctor for your situation.
Questions About Pao Pereira or Calcium Carbonate
These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Pao Pereira or Calcium Carbonate, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:
- Taking Doxycycline And Synthroid Together ›
- Can You Take A Z-Pack (Azithromycin) With Antacids? ›
- Can You Take Prilosec With Milk Of Magnesia? ›
Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.
See Every Supplement That Interacts With Calcium Carbonate
This page covers Pao Pereira only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Calcium Carbonate page lists 30 supplements it has a documented interaction with, worst first, each one explained.
The most serious there right now: Activated Charcoal (major), Cinchona (moderate), Coffee Charcoal (moderate), European Mandrake (moderate) and Glucomannan (moderate).
By severity: 1 major · 10 moderate · 19 minor.
From our pharmacist’s overview on the Calcium Carbonate page
“Calcium carbonate (Tums, Os-Cal) feels like the most harmless thing in the medicine cabinet, which is exactly why its supplement list deserves a careful read, led by activated charcoal, the single major-rated entry. Charcoal adsorbs many medicines in the gut and can strip away their effect, and it does not spare oral drugs taken alongs…”
Reviewed by 2 · Jul 18, 2026
Taking Pao Pereira as Part of a Dietary Supplement Product? Check It for Interactions
We hold 1 real supplement products containing Pao Pereira, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Pao Pereira. Even though Pao Pereira itself has no known interaction with Calcium Carbonate, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:
Where Pao Pereira and Calcium Carbonate Sit Against Everything Else
Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.
#1,261 of 1,452 supplements looked up here in the last 7 days
#539 of 2,830 medications looked up here in the last 7 days
Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.
Where does our data come from?
- Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions. Pao Pereira is not yet covered by that licensed database, so its write-up cites publicly available medical sources directly (see the references below).
- Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Pao Pereira reference on this page ↓
- Freshness: we automatically re-check this combination every week — this pair was last verified September 27, 2026. The Pao Pereira and Calcium Carbonate records this page draws on were last updated June 22, 2026.
- What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
About Pao Pereira
What is Pao Pereira?
- Immune support
- Cancer support (complementary use)
- Antimalarial/fever (traditional)
- Digestive complaints (traditional)
- General tonic
Pao Pereira is a bark extract from a South American tree that is marketed mainly as a complementary cancer and immune-support supplement. Human evidence is very limited, and most research comes from laboratory and animal studies, so it should not be used in place of proven medical care. Talk with your pharmacist or doctor before trying it, especially if you have a serious health condition.
Geissospermum laeve · Apocynaceae · Bark (and bark extract) · Capsules, tinctures, liquid extracts, powdered bark
An interaction check asks whether these two react with each other — it does not ask whether Pao Pereira is a good idea for someone in your situation. Here is what our Pao Pereira record says about it on its own.
Pao Pereira: dosing
There is no established or standardized dose for Pao Pereira. Different products contain different amounts and strengths of bark extract.If you choose to use it, follow the directions on the product label and do not exceed the recommended amount.
From our Pao Pereira monograph — the full record covers uses, side effects and every documented interaction.
About Calcium Carbonate
What Is Calcium Carbonate Used For?
Brand names: Tums, Os-Cal, Adcal, Calcichew, Adcal-D3
Most calcium carbonate products are used as an antacid — they quickly relieve heartburn, acid indigestion, sour stomach, and upset stomach. This covers a wide range of brands including Tums, Rolaids, CAREONE Extra Strength, Calcium Carbonate Chewable Antacid, exchange select Extra Strength Antacid, Extra Strength Smooth, and the Children's Antacid and Children's Stomach Relief Antacid liquids.
Some products go beyond antacid use. Ki No Sin (capsule) is used as a health supplement to aid body functions affected by diabetes and kidney disease, and to help maintain normal calcium levels. Na Mi Cal is a supplement intended to support healthy bone development and help prevent osteoporosis. TC Max oral solution is indicated for the relief of heartburn, acid indigestion, sour stomach, and upset stomach.
Most-Reported Side Effects for Calcium Carbonate
From FAERS, the FDA’s public side-effect reporting system (73,758 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.
Other Drugs & Pao Pereira
Browse every other medication we’ve checked against Pao Pereira — both the ones with a known interaction and the ones without. Select any drug for the full detail.
No drugs match “”.
No interaction 2,829 drugs checked — show the list
We also checked Pao Pereira against these medications and found no known interaction in our sources. Open any page to confirm.
- Apixaban ›
- Levothyroxine ›
- Amlodipine ›
- Methylphenidate ›
- Warfarin ›
- Abemaciclib ›
- Ivermectin ›
- Testosterone ›
- Sertraline ›
- Acetaminophen ›
- Losartan Potassium ›
- Aspirin ›
- Rosuvastatin ›
- Metoprolol ›
- Escitalopram ›
- Clopidogrel ›
- Rivaroxaban ›
- Atorvastatin ›
- Isotretinoin ›
- Tirzepatide ›
- Warfarin Sodium ›
- Amlodipine Besylate ›
- Ibuprofen ›
- Methamphetamine ›
- Docusate ›
- Sumatriptan ›
- Tadalafil ›
- Valacyclovir ›
- Hydroxyurea ›
- Prednisone ›
- Metformin ›
- Semaglutide ›
- Amitriptyline ›
- Lisdexamfetamine ›
- Amphetamine ›
- Propranolol ›
- Levothyroxine, Liothyronine ›
- Amoxicillin ›
- Methotrexate ›
- Lisinopril ›
- Bupropion ›
- Fluoxetine ›
- Bendamustine ›
- Azithromycin ›
- Pregabalin ›
- Doxycycline ›
- Dextroamphetamine ›
- Gabapentin ›
- Lamotrigine ›
- Acyclovir ›
- Naproxen ›
- Quetiapine ›
- Acetaminophen, Aspirin, Caffeine ›
- Clonazepam ›
- Buspirone ›
- Omeprazole ›
- Duloxetine ›
- Letrozole ›
- Citalopram ›
- Acetaminophen, Codeine ›
Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Pao Pereira list.
Pao Pereira References
The 4 sources that drive our Pao Pereira monograph — publicly available pages from reputable medical and government organizations. Every link was verified to work before publishing. Pao Pereira is not covered by the licensed Natural Medicines interaction database, so its page cites these public sources directly.
- About Herbs, Botanicals & Other Products — Memorial Sloan Kettering Cancer Center Source
- Using Dietary Supplements Wisely — NIH NCCIH Source
- Dietary Supplements: What You Need to Know — NIH Office of Dietary Supplements Source
- Herbs at a Glance — NIH NCCIH Source
Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.
Calcium Carbonate Is Linked to Lower Levels of 4 Nutrients
Natural Medicines records Calcium Carbonate as a medicine that can lower these. This is not an interaction with Pao Pereira — it is a separate effect of the medicine, and it is a reason some people are advised to supplement rather than to avoid one:
Read the full Calcium Carbonate nutrient depletion report ›
Depletion records come from the licensed Natural Medicines database. Do not start a supplement on the strength of this page — ask your pharmacist or doctor whether it applies to you.
Taking Pao Pereira and Calcium Carbonate Together: Common Questions
Is it safe to take Pao Pereira with Calcium Carbonate?
Does Calcium Carbonate interact with any supplements?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
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Still Have a Question About Calcium Carbonate and Pao Pereira?
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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.