To reduce the development of drug-resistant bacteria and maintain the effectiveness of tetracycline hydrochloride and other antibacterial drugs, tetracycline hydrochloride should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria.

Tetracycline is a yellow, odorless, crystalline powder. Tetracycline is stable in air but exposure to strong sunlight causes it to darken. Its potency is affected in solutions of pH below 2 and is rapidly destroyed by alkali hydroxide solutions. Tetracycline is very slightly soluble in water, freely soluble in dilute acid and in alkali hydroxide solutions, sparingly soluble in alcohol, and practically insoluble in chloroform and in ether. The chemical name for tetracycline hydrochloride is 4-(Dimethylamino) -1,4,4a,5,5a,6,11,12a-octahydro-3,6,10,12,-12a-pentahydroxy-6-methyl-1,11-dioxo-2-naphthacenecar-boxamide monohydrochloride. Its structural formula is as follows:

Each capsule, for oral administration, contains 250 mg or 500 mg tetracycline hydrochloride.

Inactive Ingredients: Lactose, and magnesium stearate.

The 250 mg and 500 mg capsule shells contain D&C Yellow No. 10, FD&C Yellow No. 6, gelatin, sodium lauryl sulfate, and titanium dioxide.

The imprinting ink for the 250 mg and 500 mg capsules contains D&C Yellow No. 10, FD&C Blue No. 1, FD&C Blue No. 2, FD&C Red No. 40, iron oxide black, pharmaceutical shellac glaze, propylene glycol, n-butyl alcohol, and ferrosoferric oxide.

This product complies with USP dissolution Test 2.

Tetracyclines are readily absorbed and are bound to plasma protein in varying degrees. They are concentrated by the liver in the bile and excreted in the urine and feces at high concentrations in a biologically active form.

To reduce the development of drug-resistant bacteria and maintain the effectiveness of tetracycline hydrochloride and other antibacterial drugs, tetracycline hydrochloride should be used only to treat infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.

Tetracycline is indicated in the treatment of infections caused by susceptible strains of the designated organisms in the conditions listed below:

• Upper respiratory tract infections caused by Streptococcus pyogenes, Streptococcus pneumoniae and Hemophilus influenzae. Note: Tetracycline should not be used for streptococcal disease unless the organism has been demonstrated to be susceptible.
• Lower respiratory tract infections caused by Streptococcus pyogenes, Streptococcus pneumoniae, Mycoplasma pneumoniae (Eaton agent, and Klebsiella sp.)
• Skin and soft tissue infections caused by Streptococcus pyogenes, Staphylococcus aureaus. (Tetracyclines are not the drugs of choice in the treatment of any type of staphylococcal infections.)
• Infections caused by rickettsia including Rocky Mountain spotted fever, typhus group infections, Q fever, rickettsialpox.
• Psittacosis caused by Chlamydophila psittaci.
• Infections caused by Chlamydia trachomatis such as uncomplicated urethral, endocervical or rectal infections, inclusion conjunctivitis, trachoma, and lymphogranuloma venereum.
• Granuloma inquinale caused by Klebsiella granulomatis.
• Relapsing fever caused by Borrelia sp.
• Bartonellosis caused by Bartonella bacilliformis.
• Chancroid caused by Hemophilus ducreyi.
• Tularemia caused by Francisella tularensis.
• Plaque caused by Yersinia pestis.
• Cholera caused by Vibrio cholerae.
• Brucellosis caused by Brucella species (tetracycline may be used in conjunction with an aminoglycoside).
• Infections due to Campylobacter fetus.
• As adjunctive therapy in intestinal amebiasis caused by Entamoeba histolytica.
• Urinary tract infections caused by susceptible strains of Escherichia coli, Klebsiella, etc.
• Other infections caused by susceptible gram-negative organisms such as E. coli, Enterobacter aerogenes, Shigella sp., Acinetobacter sp., Klebsiella sp., and Bacteroides sp.
• In severe acne, adjunctive therapy with tetracycline may be useful.

When penicillin is contraindicated, tetracyclines are alternative drugs in the treatment of the following infections:

• Syphilis and yaws caused by Treponema pallidum and pertenue, respectively,
• Vincent’s infection caused by Fusobacterium fusiforme,
• Infections caused by Neisseria gonorrhoeae,
• Anthrax caused by Bacillus anthracis,
• Infections due to Listeria monocytogenes,
• Actinomycosis caused by Actinomyces species,
• Infections due to Clostridium species.

This drug is contraindicated in persons who have shown hypersensitivity to any of the tetracyclines.

Gastrointestinal: anorexia, nausea, epigastric distress, vomiting, diarrhea, glossitis, black hairy tongue, dysphagia, enterocolitis, and inflammatory lesions (with Candida overgrowth) in the anogenital region.

Esophagitis and esophageal ulceration have been reported in patients receiving particularly the capsule and also the tablet forms of tetracyclines.

Most of the patients were reported to have taken medication immediately before going to bed (see DOSAGE AND ADMINISTRATION).

Teeth: permanent discoloration of teeth may be caused during tooth development. Enamel hypoplasia has been reported (see WARNINGS).

Skin: maculopapular and erythrematous rashes. Exfoliative dermatitis has been reported. Onycholysis and discoloration of the nails have been reported. Photosensitivity is discussed in WARNINGS.

Renal Toxicity: an increase in BUN has been reported and is dose related.

Liver: hepatotoxicity and liver failure have been observed in patients receiving tetracycline and in tetracycline-treated patients with renal impairment.

Hypersensitivity Reactions: urticaria, angioneurotic edema, anaphylaxis, anaphylactoid purpura, pericarditis, exacerbation of systemic lupus erythematosus, and serum sickness-like reactions, as fever, rash, and arthralgia.

Blood: hemolytic anemia, thrombocytopenia, thrombocytopenic purpura, neutropenia and eosinophilia have been reported.

When given over prolonged periods, tetracyclines have been reported to produce brown-black microscopic discoloration of thyroid glands. No abnormalities of thyroid function studies are known to occur.

To report SUSPECTED ADVERSE REACTIONS, contact Avet Pharmaceuticals Inc. at 1-866-901-DRUG (3784) or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

In case of overdosage, discontinue medication, treat symptomatically and institute supportive measures. Tetracycline is not dialyzable.

Adults: Usual daily dose, 1 gram as 500 mg twice a day or 250 mg four times a day. Higher doses such as 500 mg four times a day may be required for severe infections or for those infections which do not respond to the smaller doses.

For pediatric patients above eight years of age: Usual daily dose, 10 mg/lb to 20 mg/lb (25 mg/kg to 50 mg/kg) body weight divided in four equal doses.

Administration of adequate amounts of fluid with the capsule formulation of tetracycline is recommended to wash down the drug and reduce the risk of esophageal irritation and ulceration (see ADVERSE REACTIONS).

Absorption of tetracycline is impaired by antacids containing aluminum, calcium or magnesium and preparations containing iron, zinc or sodium bicarbonate. Food and some dairy products also interfere with absorption.

When used in streptococcal infections, therapy should be continued for 10 days.

For treatment of brucellosis, 500 mg tetracycline four times a day for three weeks accompanied by streptomycin, 1 gram intramuscularly twice daily the first week and once daily the second week.

For the treatment of syphilis in patients allergic to penicillin, the following dosage of tetracycline is recommended: early syphilis (less than one year’s duration), 500 mg four times a day for 15 days. Syphilis of more than one year’s duration (except neurosyphilis), 500 mg four times a day for 30 days.

For treatment of gonorrhea, the recommended dose is 500 mg by mouth four times a day for seven days.

Uncomplicated urethral, endocervical or rectal infections in adults caused by Chlamydia trachomatis: 500 mg, by mouth, four times a day for at least seven days.

In cases of moderate to severe acne which, in the judgement of the clinician, require long-term treatment, the recommended initial dosage is 1 gram daily in divided doses. When improvement is noted, reduce dosage gradually to maintenance levels ranging from 125 mg to 500 mg daily. In some patients it may be possible to maintain adequate remission of lesions with alternate day or intermittent therapy. Tetracycline therapy of acne should augment the other standard measures known to be of value. Duration of long-term treatment which can safely be recommended has not been established (see WARNINGS and Carcinogenesis, Mutagenesis, Impairment of Fertility).

Tetracycline Hydrochloride Capsules, USP are available as:

250 mg: Yellow Opaque Cap/Yellow Opaque Body, Cap and Body Imprinted 5225 in Black Ink.

Available in bottles of:

100 capsules - NDC 23155-766-01

500 mg: Orange Opaque Cap/Yellow Opaque Body, Cap and Body Imprinted 5266 in Black Ink.

Available in bottles of:

100 capsules - NDC 23155-767-01

Dispense in a tight, light-resistant container as defined in the USP. Use child-resistant closure (as required).

Store at 20° to 25°C (68° to 77°F) [See USP Controlled Room Temperature].

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Hyperpigmentation of the thyroid has been produced by members of the tetracycline class in the following species: in rats by oxytetracycline, doxycycline, minocycline, tetracycline PO4 and methacycline; in minipigs by doxycycline, minocycline, tetracycline PO4 and methacycline; in dogs by doxycycline and minocycline; in monkeys by minocycline.

Minocycline, tetracycline PO4, methacycline, doxycycline, tetracycline base, oxytetracycline HCl and tetracycline HCl were goitrogenic in rats fed a low iodine diet. This goitrogenic effect was accomplished by high radioactive iodine uptake. Administration of minocycline also produced a large goiter with high radioiodine uptake in rats fed a relatively high iodine diet.

Treatment of various animal species with this class of drugs has also resulted in the induction of thyroid hyperplasia in the following: in rats and dogs (minocycline), in chickens (chlortetracycline) and in rats and mice (oxytetracycline). Adrenal gland hyperplasia has been observed in goats and rats treated with oxytetracycline.

Distributed by:

Avet Pharmaceuticals Inc.

East Brunswick, NJ 08816

1-866-901-DRUG (3784)

51U000000351US01

Revised: 03/2020

​NDC​ 23155-​766​-01

Tetracycline Hydrochloride Capsules, USP

250 mg

100 Capsules

Rx Only

​NDC ​23155-767-01

Tetracycline Hydrochloride Capsules, USP

500 mg

100 Capsules

Rx Only