Tablet nitrofurantoin 100mg?

Yes. Nitrofurantoin is available as 100 mg doses (often capsules). There are two common formulations people refer to:

- Nitrofurantoin macrocrystal (Macrodantin): usually 100 mg capsules. Typical adult dosing for an uncomplicated UTI is 100 mg every 6 hours (four times daily) for about 7 days (some regimens use 5–7 days).

- Nitrofurantoin monohydrate/macrocrystal (Macrobid): 100 mg capsules taken twice daily (every 12 hours) for about 5 days for acute cystitis in nonpregnant adults.

General tips:
- Take with food or milk to improve absorption and reduce stomach upset.
- Don’t use if you have significant kidney impairment (creatinine clearance usually below about 60 mL/min is a concern) and avoid near the end of pregnancy (term).
- Common side effects: nausea, upset stomach, diarrhea, headache; urine may turn dark yellow/brown (harmless). Rare but serious: lung, liver, or nerve problems; allergic reactions.

If you have a prescription:
- I can help interpret the exact dosing (some regimens are qid, others bid) and what it means for you.
- If you’re not sure why you were prescribed it, or if you’re pregnant, have kidney problems, or are taking other medicines (antacids, etc.), tell me and I’ll tailor the info.

Would you like dosing guidance for a specific regimen, or are you looking for safety and interactions? If you have a prescription, sharing the exact wording (e.g., “100 mg capsules, take one every 6 hours for 7 days”) would help me clarify.