646 L Pill — WHITE ROUND, 7mm — Doxycycline
| Imprint | 646 / L |
|---|---|
| Colour | WHITE |
| Shape | ROUND |
| Size | 7 |
| Strength | DOXYCYCLINE HYCLATE 20 mg |
| Dosage form | Tablet, Film Coated |
| Manufacturer | Alembic Pharmaceuticals Inc. |
| NDC | 62332-352 |
| Schedule | — |
| Availability | Prescription only |
| Ingredients | DOXYCYCLINE HYCLATE[DOXYCYCLINE ANHYDROUS] |
What does this imprint mean?
The imprint "646 L" is a code stamped or printed on the tablet or capsule by the manufacturer, used to identify the drug, its strength and the maker.
Active ingredient
Doxycycline
Uses and warnings
Key warnings include: - Tetracycline use during tooth development (last half of pregnancy through age 8) may cause permanent tooth discoloration and enamel hypoplasia - *Clostridioides difficile*-associated diarrhea can occur and may be severe or fatal - Severe skin reactions including Stevens-Johnson syndrome and toxic epidermal necrolysis reported - Intracranial hypertension (pseudotumor cerebri) associated with use, particularly in women of childbearing age - Photosensitivity reactions possible; patients should avoid excessive sun exposure - Tetracyclines cross the placenta with potential fetal toxicity
Doxycycline treats bacterial infections including rickettsial infections, respiratory tract infections caused by Mycoplasma pneumoniae, sexually transmitted infections (chlamydia, gonorrhea, syphilis), and gram-negative bacterial infections. It's also used for malaria prophylaxis in travelers and post-exposure anthrax prevention. The label emphasizes: "doxycycline hyclate should be used only to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria."
How to identify this pill
- • Check the imprint matches exactly: "646 L".
- • Confirm the colour (WHITE) and shape (ROUND).
- • Compare the size (7) against a ruler if possible.
- • When in doubt, confirm with a pharmacist before taking any medication.
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Official references
Source: FDA Structured Product Label via NLM Pillbox archive (retired 2021); source file e0d313ec-650d-4dcb-a3f6-8649feccd915.xml