Methenamine Foods to Avoid: 3 Things to Avoid or Watch
Quick answer
Which foods should you avoid when taking methenamine? The mandelate label says to restrict or avoid milk products and antacids containing sodium carbonate or bicarbonate. The hippurate label names no foods.
This is general information, not medical advice. Ask your doctor or pharmacist about your own situation.
Key takeaways
- The methenamine mandelate label says to restrict or avoid milk products and antacids containing sodium carbonate or bicarbonate.
- The reason given on that label is to assure an acidic pH.
- The methenamine hippurate label says restriction of alkalinizing foods and medications is desirable, but it does not name them.
- Ask your prescriber or pharmacist which foods and medicines apply to you.
The list at a glance
| # | Food, drink or supplement | What to do | Source |
|---|---|---|---|
| 1 | Milk products | Limit: Ask your prescriber whether to cut back on milk products or skip them. | FDA drug label |
| 2 | Antacids containing sodium carbonate or bicarbonate | Limit: Ask your pharmacist to check the antacids you use for these ingredients. | FDA drug label |
| 3 | Other alkalinizing foods and medications | Ask first: Ask your prescriber or pharmacist which foods and medicines this covers. | FDA drug label |
The foods to avoid when taking methenamine make a short list, because the FDA drug labels say little. One label names milk products and a type of antacid. The other says alkalinizing foods and medications should be restricted, without saying which ones.
What foods should you avoid when taking methenamine?
Methenamine is sold as methenamine hippurate and as methenamine mandelate, and each form has its own label on DailyMed, the National Library of Medicine’s drug label site. The mandelate label names milk products and antacids containing sodium carbonate or bicarbonate. The hippurate label speaks of alkalinizing foods and medications in general and names none.
How this list was made
Each item below quotes the label sentence it comes from. One label says to restrict or avoid, and the other calls restriction desirable, so the list marks items Limit or Ask first. The mandelate label gives one reason for its instruction: to assure an acidic pH. Your prescriber’s advice comes first.
1. Milk products
If you take methenamine mandelate, the label says to restrict or avoid milk products. It does not say how much is too much or name particular milk products, so ask your prescriber how it applies to you.
The methenamine mandelate label says: “To assure an acidic pH, patients should be instructed to restrict or avoid milk products and antacids containing sodium carbonate or bicarbonate.”
The hippurate label does not name milk products; the milk instruction comes from the mandelate label only. If you are not sure which form you have, the pharmacy label or your pharmacist can tell you.
2. Antacids containing sodium carbonate or bicarbonate
Can you use an antacid with methenamine mandelate? The label says patients should restrict or avoid antacids containing sodium carbonate or bicarbonate. It names only antacids with those ingredients, and a pharmacist can check the ingredients of a product you already use.
The same mandelate sentence names them together with milk products: “restrict or avoid milk products and antacids containing sodium carbonate or bicarbonate.”
An antacid is a medicine, not a food, but the label puts it in the same sentence as milk products, so it belongs on this list. The reason it gives for both is to assure an acidic pH. For any other product, ask your pharmacist.
3. Other alkalinizing foods and medications
Does the methenamine hippurate label name foods to avoid? No. It says restriction of alkalinizing foods and medications is desirable and stops there, so ask your prescriber or pharmacist which foods and medications that covers for you.
The methenamine hippurate label says: “Therefore, restriction of alkalinizing foods and medications is desirable.”
Neither label lists which foods count as alkalinizing, so any list of them would be a guess.
Can you have milk with methenamine?
The methenamine mandelate label says patients should restrict or avoid milk products, so check with your prescriber before you keep them in your diet. The hippurate label does not name milk products; it covers alkalinizing foods and medications in general. If you take the hippurate form, ask your prescriber whether to limit milk products too.
Does the methenamine label list other foods to avoid?
No. Between them, the two labels name milk products and antacids containing sodium carbonate or bicarbonate, and mention alkalinizing foods and medications without naming them. For a specific food, drink or medicine, ask your prescriber or pharmacist.
What should you ask your pharmacist about methenamine?
Questions you can take to the counter:
- Which form of methenamine do I have, hippurate or mandelate?
- Do any of the antacids or other medicines I use contain sodium carbonate or bicarbonate?
- Which foods and medications count as alkalinizing for my prescription?
- Does the instruction about milk products apply to my form of the medicine?
Your prescriber also knows your health history and why the medicine was prescribed, which a label cannot account for.
Where can you read the methenamine labels yourself?
Both labels are on DailyMed. You can read the methenamine hippurate prescribing information and the methenamine mandelate label in full. Labels get updated, so the current version may differ from the sentences quoted here.
Other medicines come with very different food and drink instructions. Compare the wording on our pages about cyclosporine, disulfiram and the slow COMT diet.
This page is general information from drug labels. It is not medical advice, and it does not tell you what to change about your medicine or your meals.
Frequently asked questions
What are the foods to avoid when taking methenamine?
The methenamine mandelate label says patients should restrict or avoid milk products and antacids containing sodium carbonate or bicarbonate. The hippurate label says restricting alkalinizing foods and medications is desirable, without naming any. Your prescriber or pharmacist can tell you which apply to your form of the medicine.
Does the methenamine label say to avoid milk products?
The methenamine mandelate label does. It says patients should be instructed to restrict or avoid milk products, to assure an acidic pH. The hippurate label sentence used on this page does not name milk products, so ask your prescriber which form you take and what applies.
Which foods should I avoid when taking methenamine hippurate?
The hippurate label says restriction of alkalinizing foods and medications is desirable. It does not name which foods or medications those are, and this page does not add any. Ask your prescriber or pharmacist for the specific foods and medicines that apply to you.
What does the methenamine label say about antacids?
The mandelate label says patients should restrict or avoid antacids containing sodium carbonate or bicarbonate, to assure an acidic pH. It names those antacids only by that description. Ask your pharmacist whether an antacid you use fits that description.
Who decides what I should avoid while taking methenamine?
Your prescriber or pharmacist. The two labels used here give a short instruction about milk products, certain antacids and alkalinizing foods and medications. They do not cover every food, medicine or health condition, so personal questions belong with the person who prescribed it.
