Doryx: Uses, Dosage, Side Effects, and Composition



Description and Composition of Doryx

Doryx is a second generation semi-synthetic derivative of tetracycline antibiotic. It contains doxycycline as its active pharmaceutical ingredient plus other inactive ingredients called excipients.

Mechanism of Actions and Pharmacology Doryx

Doryx is a bacteriostatic agent, with a wide range of anti microbial activity. It interferes with bacterial protein synthesis by reversibly binding to bacterial 30S ribosomal subunit, thus preventing the binding of aminoacyl transfer-RNA to the messenger-RNA ribosome complex. Doryx is readily absorbed from the gastro-intestinal tract and is excreted mainly urine.

Indications and Uses of Doryx

  • Rickettsial infections, including typhus, Rocky Mountain spotted fever and Q fever.

  • Chlamydial infections, including psittacosis, lymphogranuloma venereum, trachoma
  • Mycoplasmal infections, especially those caused by Mycoplasma pneumoniae, and inclusion conjunctivitis.

  • Brucellosis and plague (use in association with streptomycin).
  • Tularemia, chronic bronchitis, chancroid, granuloma inguinale, urinary tract infections, acne.

  • Malabsorption syndromes such as tropical sprue and Whipple’s disease.

  • Cholera, relapsing fever, leptospirosis and early stage of Lyme disease.
  • Balantidiasis, amoebic dysentery (use in association with an amoebicide).

  • Syphilis, yaws, gonorrhoea, actinomycosis, anthrax, rat bite fever and acute necrotising ulcerative gingivitis.

Contraindications of Doryx

Doryx is not to be used in some persons and in situations if when it is indicated. Some of where it should not be used are as enlisted below.

  • Avoid the use of Doryx in patients who have shown hypersensitivity to tetracyclines.

  • The use of Doryx is not recommended during the last half of pregnancy, nursing or breastfeeding mothers and children under the age of 8 years as tetracyclines may cause permanent discolouration of the teeth, enamel hypoplasia and inhibition of linear skeletal growth.

Precautions to Observe while Using Doryx

  • Care must be taken when liver function is impaired,

  • Doryx may Interfere with some diagnostic tests including determination of urine catecholamines and glucose.

  • It is unsafe in patients with porphyria

Side Effects of Doryx

Some side effects associated with the use of Doryx including the following:

  • Nausea, vomiting and diarrhoea.
  • Discoloration of infant’s or children’s teeth
  • Cramps or buming of the stomach.

  • Sore mouth or tongue (fungal overgrowth, hypertrophy of the papilla)

  • Increased sensitivity to sunlight

  • Itching of the rectal or genital areas.

  • Hepatotoxicity

  • Leukocytosis, neutropenia, leukopenia, atypical lymphocytes, toxic granulation of granulocytes, haemolytic anaemia, thrombocytopenia and thrombocytopenic purpura has occured.
Please note that you can experience other side effects other than what is written here. Never forget to report to your health care provider if the effects are serious.

Doryx Drug Interactions

This list below are drugs that interact with Doryx and therefore should not be taken together or caution observed while using it together.

  • Alkalis, aluminium hydroxide, calcium, iron and magnesium diminish the absorption of doxycycline.
  • Concurrent use with penicillin, barbiturates, carbamazepine, phenytoin and sodium bicarbonate is not recommended.

  • Hepatotoxic and nephrotoxic drugs should not be given with doxycycline. Examples of these drugs can be gotten from your doctor or pharmacist if needed.

Overdosage Clinical features of Doryx

If Doryx is overdosed, some of the symptoms and clinical features you may experience include the following:
  • Nausea
  • Anorexia
  • Diarrhoea
  • Perianal itching
  • Skin eruption
  • Fever
  • Anaphylaxis
  • Liverdamage.

Treatment of Doryx Overdosage

If you overdose Doryx, the following measures are recommended:
  • Call your healthcare provider or local poison control immediately if you are an out patient.
  • Emesis or gastric lavage, if appropriate; with the necessary emergency measures, if required.

Dosage and Administration of Doryx

Adults: Oral, 200 mg on the first day, then 100 mg once daily.

Acne: Oral, 50 mg daily for 6 10 weeks,

Note: Effect of Doryx on teeth should be considered. Therapy should be continued for at least 10 days in group A beta-haemolytic streptococcal infections.

Storage of Doryx

How to store Doryx: Store below 25 C. Protect from light and moisture. Keep every medicine away from children.

Chemical Structure of Doryx

Doxycycline chemical structure
Doryx chemical structure

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