1.Product Overview

Product Name	Doxycycline Tablets/Capsules, USP
Reference Listed Drug (RLD)	Vibramycin® (Pfizer)
Pharmaceutical Form	Tablet/Capsule (Immediate Release)
Strength	100 mg

2.Indications and Usage

Doxycycline is a tetracycline-class antibacterial indicated for:

Rickettsial Infections	Rocky Mountain spotted fever, typhus group, Q fever.
Sexually Transmitted Infection	Uncomplicated urethral, endocervical, or rectal infections caused by Chlamydia trachomatis; uncomplicated gonorrhea; lymphogranuloma venereum.
Respiratory Tract Infections	Pneumonia caused by Mycoplasma pneumoniae; treatment of Haemophilus influenzae or Streptococcus pneumoniae (when susceptibility testing indicates appropriate use).
Specific Bacterial Infections	Anthrax (including inhalational anthrax, post-exposure), cholera, plague, tularemia.
Ophthalmic Infections	Trachoma.
Dermatologic Infections	Severe acne.
Other	Malaria prophylaxis (for short-term travel to areas with chloroquine and/or pyrimethamine-sulfadoxine resistant strains).

Note: Doxycycline is indicated when susceptibility testing proves the causative organism is susceptible. It is not the drug of choice for any staphylococcal infection.

3.Dosage and Administration

Important Administration Instructions	Administration of Doxycycline with adequate amounts of fluid is recommended to wash down the drug and reduce the risk of esophageal irritation and ulceration.
	If gastric irritation occurs, it may be taken with food or milk.
	Photosensitivity can occur; patients should avoid excessive sunlight and UV light.

Standard Adult Dosing

Indication	Dosage	Duration
Most Serious	Initial: 100 mg every 12 hours on Day 1.	Varies by infection.
Infections	Maintenance: 100 mg per day (given as a single dose or 50 mg every 12 hours)	Varies by infection.
Malaria Prophylaxis	100 mg once daily.	Begin 1-2 days before travel, continue daily during travel, and for 4 weeks after leaving the endemic area.
Severe Acne	50 mg to 100 mg daily.	Varies.

4.Comparison of Oral Tetracycline-Class Antibiotics

Feature	Doxycycline Capsules	Doxycycline Tablets	Minocycline	Tetracycline (Tetracycline HCl)
Primary Indication(s)	Broad-spectrum: Respiratory, STI, Rickettsial, Acne, Malaria Prophylaxis.	Identical to Capsules.	Broad-spectrum: Primarily Acne, some bacterial infections.	Broad-spectrum: Acne, H. pylori regimens, others (less common use now).
Absorption (Bioavailability)	High (~90-100%)	High (~90-100%)	High (~100%)	Moderate (~60-80%)
Impact of Food/Dairy	Minimal impact on absorption (can be taken with food/milk).	Minimal impact on absorption (can be taken with food/milk).	Minimal impact on absorption (can be taken with food/milk).	Significantly impaired by food, dairy, and antacids. Must be taken on an empty stomach.
Standard Adult Dosing	100 mg once or twice daily.	100 mg once or twice daily.	50-100 mg twice daily.	250-500 mg four times daily (QID).
Key Differentiator	Favorable dosing (QD/BID). Can take with food. Capsule form (patient preference).	Favorable dosing (QD/BID). Can take with food. Tablet form (may be scored/split).	High tissue penetration (including CNS). Higher risk of vestibular side effects (dizziness).	Inconvenient dosing (QID). Strict dietary restrictions (empty stomach).

5.Advantages of Our Doxycycline Tablets and Capsules

Cost-Effectiveness	As a time-tested, foundational antibiotic, the generic version offers exceptional affordability, making it a first-line choice for many common infections and accessible to the broadest possible patient population.
Therapeutic Equivalence (A-Rated)	As FDA-approved generics (Tablets ANDA 211343; Capsules ANDA 209402), they are guaranteed to be bioequivalent to the reference drug (Vibramycin®), ensuring the same high level of clinical efficacy, safety, and drug absorption as the brand-name product.
cGMP Manufacturing Standards	Produced under the FDA's stringent Current Good Manufacturing Practices (cGMP), ensuring that every capsule meets the highest standards for quality, potency, and purity.