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Doxycycline uses

Pharmacological action

Doxycycline is an semisynthetic tetracycline group's antibiotic of broad-spectrum. This medication has bacteriostatic action due to suppression of protein synthesis of pathogens. It active against aerobic gram-positive bacteria: Staphylococcus spp., Streptococcus spp. (including Streptococcus pneumoniae), Bacillus anthracis, Listeria monocytogenes; anaerobic bacteria: Clostridium spp.

Doxycycline is also active against aerobic gram-negative bacteria: Neisseria gonorrhoeae, Escherichia coli, Shigella spp., Salmonella spp., Enterobacter spp., Klebsiella spp., Bordetella pertussis, as well as against Rickettsia spp., Treponema spp., Mycoplasma spp. and Chlamydia spp.

Pseudomonas aeruginosa, Proteus spp., Serratia spp., most strains of Bacteroides fragilis are resistant to Doxycycline.


After oral administration Doxycycline is quickly and almost completely absorbed from the gastrointestinal tract. Ingestion has very little effect on the absorption of Doxycycline. This medication is widely distributed in tissues and body fluids. Plasma protein binding is 80-95%. T1/2 is 12-22 h. Doxycycline excreted in the urine as unchanged (40%) but the main part of the dose excreted unchanged in the feces through bile secretion.

Why is Doxycycline prescribed?

Infectious-inflammatory diseases caused by microorganisms sensitive to Doxycycline including infections of the respiratory and ENT organs; gastrointestinal tract infections; purulent infections of skin and soft tissues ; infection of the genitourinary system (including gonorrhea, primary and secondary syphilis); typhus, brucellosis, rickettsiosis, osteomyelitis, trachoma, chlamydia.

Dosage and administration

Doxycycline is indicated for adults orally or IV (infusions) in 200 mg / day dosess on the first day of treatment, in the coming days at 100-200 mg / day. Multiplicity of admission (or IV infusion) is 1-2 times / day. For children older than 8 years of age and weighing over 50 kg the daily Doxycycline dose for oral administration or IV (infusion) in the first day of treatment is 4 mg / kg. In next days ir is 2-4 mg / kg depending on the severity of the clinical course of disease. Multiplicity of admission (or intravenous infusion) is 1-2 times / day. The recommended minimum time for IV infusion 100 mg of Doxycycline (a concentration of infusion solution is 0.5 mg / ml) is 1 hour.

Maximum doses: for adults for oral administration is 300 mg / day or 600 mg / day (depending on the etiology of the agent); for iv injection it is 300 mg / day.


Doxycycline side effects, adverse reactions

Digestive system: nausea, vomiting, anorexia, abdominal pain, diarrhea, constipation, dysphagia, glossitis, esophagitis, transient increase in the blood of hepatic transaminases, alkaline phosphatase, bilirubin.

Hematopoietic system: neutropenia, thrombocytopenia, hemolytic anemia.

Allergic reactions: skin rash, itching, eosinophilia, rarely - angioedema, photosensitivity.

Other: increased residual nitrogen, candidiasis, intestinal dysbiosis, discoloration of teeth in children.

Doxycycline contraindications

Pregnancy, children age up to 8 years, hypersensitivity to tetracyclines, porphyria, severe liver insufficiency, leukopenia, lactation period, myasthenia (for IV administration).

Using during pregnancy and breastfeeding

Doxycycline is contraindicated during pregnancy and lactation. Doxycycline crosses the placental barrier. This medication may cause long-term discoloration of the teeth, enamel hypoplasia, inhibition of growth of bones of the fetus and also the development of fatty liver.

If necessary using during lactation patients should stop breastfeeding.

Special instructions

With careful use of Doxycycline with impaired liver function. If a patient has renal impairment the dose adjustment is not required.

To prevent local irritating action Doxycycline should be taken during the day with plenty of fluids, food or milk. Due to possible development of photosensitivity it is necessary the restriction of insolation during treatment and for 4-5 days thereafter.

Doxycycline is not used in children younger than 8 years because tetracyclines (including Doxycycline) are causing long-term discoloration of the teeth, enamel hypoplasia and retardation of longitudinal growth of bones in these patients.

Doxycycline solution for IV administration should be used no later than 72 hours after its preparation.

Doxycycline drug interactions

Medications containing metal ions (antacids, products containing iron, magnesium, calcium) form inactive chelates with Doxycycline, in connection with what it is necessary to avoid their simultaneous use.

It needed to avoid combination with penicillins, cephalosporins, bactericidal action and is an antagonist of bacteriostatic antibiotics (including Doxycycline).

Absorption of Doxycycline is reduced by cholestyramine and colestipol (observe the interval between the reception of at least 3 h).

Due to suppression of intestinal microflora Doxycycline reduces prothrombin index which requires dose adjustment of indirect anticoagulants.

Doxycycline reduces the reliability of contraception and increases the frequency of breakthrough bleeding while taking estrogen-containing oral contraceptives.

Simultaneous administration of Doxycycline with:

  • barbiturates, carbamazepine, phenytoin concentrations of Doxycycline in plasma decreases due to the induction of liver enzymes, which may be responsible for the decrease of its antibacterial action.
  • retinol improves intracranial pressure.

    Doxycycline in case of emergency / overdose

    Treatment: discontinuation, symptomatic and supportive therapy. Hemodialysis is ineffective.


    Doxycycline pharmaceutical active ingredients containing related brand and generic drugs:

    Active ingredient is the part of the drug or medicine which is biologically active. This portion of the drug is responsible for the main action of the drug which is intended to cure or reduce the symptom or disease. The other portions of the drug which are inactive are called excipients; there role is to act as vehicle or binder. In contrast to active ingredient, the inactive ingredient's role is not significant in the cure or treatment of the disease. There can be one or more active ingredients in a drug.

    Doxycycline available forms, composition, doses:

    Form of the medicine is the form in which the medicine is marketed in the market, for example, a medicine X can be in the form of capsule or the form of chewable tablet or the form of tablet. Sometimes same medicine can be available as injection form. Each medicine cannot be in all forms but can be marketed in 1, 2, or 3 forms which the pharmaceutical company decided based on various background research results.
    Composition is the list of ingredients which combinedly form a medicine. Both active ingredients and inactive ingredients form the composition. The active ingredient gives the desired therapeutic effect whereas the inactive ingredient helps in making the medicine stable.
    Doses are various strengths of the medicine like 10mg, 20mg, 30mg and so on. Each medicine comes in various doses which is decided by the manufacturer, that is, pharmaceutical company. The dose is decided on the severity of the symptom or disease.

    Adoxa 100 mg tablet13.86 USD
    Adoxa 50 mg tablet9.29 USD
    Adoxa 75 mg tablet12.77 USD
    Adoxa pak 1-100 mg tablet9.88 USD
    Adoxa pak 1-150 mg tablet19.93 USD
    Apo-Doxy 100 mg Capsule0.61 USD
    Apo-Doxy 100 mg Tablet0.61 USD
    Avidoxy 100 mg tablet11.52 USD
    Capsules; Oral; Doxycycline Hydrochloride 100 mg
    Capsules; Oral; Doxycycline Hydrochloride 200 mg
    Capsules; Oral; Doxycycline Hydrochloride 50 mg
    Doryx 100 mg Enteric Coated Tabs10.31 USD
    Doryx 150 mg Enteric Coated Tabs17.51 USD
    Doryx 75 mg Enteric Coated Tabs8.76 USD
    Doryx dr 100 mg tablet9.91 USD
    Doryx dr 150 mg tablet16.83 USD
    Doryx dr 75 mg tablet8.42 USD
    Doxycin 100 mg Capsule0.61 USD
    Doxycin 100 mg Tablet0.61 USD
    Doxycycline Hyclate 100 mg capsule1.18 USD
    Doxycycline Hyclate 50 mg capsule0.76 USD
    Doxycycline Monohydrate 100 mg capsule2.22 USD
    Doxycycline Monohydrate 100 mg tablet5.12 USD
    Doxycycline Monohydrate 150 mg tablet9.51 USD
    Doxycycline Monohydrate 50 mg capsule1.51 USD
    Doxycycline Monohydrate 50 mg tablet3.0 USD
    Doxycycline hyc 100 mg vial14.16 USD
    Doxycycline hyclate 100 mg tablet1.28 USD
    Doxycycline hyclate 20 mg tablet1.28 USD
    Doxycycline hyclate powder2.56 USD
    Doxycycline mono 100 mg tablet5.98 USD
    Doxycycline mono 150 mg tablet9.13 USD
    Doxycycline mono 50 mg tablet4.17 USD
    Doxycycline mono 75 mg tablet5.74 USD
    Injectable; Injection; Doxycycline 100 mg
    Monodox 100 mg capsule13.46 USD
    Monodox 50 mg capsule6.0 USD
    Monodox 75 mg capsule11.02 USD
    Novo-Doxylin 100 mg Capsule0.61 USD
    Novo-Doxylin 100 mg Tablet0.61 USD
    Nu-Doxycycline 100 mg Capsule0.61 USD
    Oracea 40 mg Delayed Release Capsule12.44 USD
    Oracea 40 mg capsule11.96 USD
    Periostat 20 mg tablet5.75 USD
    Pms-Doxycycline 100 mg Capsule0.61 USD
    Pms-Doxycycline 100 mg Tablet0.61 USD
    Vibra-tabs 100 mg tablet6.67 USD
    Vibramycin 100 mg capsule1.91 USD
    Vibramycin 25 mg/5ml Suspension 60ml Bottle36.29 USD
    Vibramycin 50 mg capsule2.41 USD
    Vibramycin 50 mg/5 ml syrup0.64 USD
    Vibramycin 50 mg/5ml Syrup0.67 USD


    Doxycycline destination | category:

    Destination is defined as the organism to which the drug or medicine is targeted. For most of the drugs what we discuss, human is the drug destination.
    Drug category can be defined as major classification of the drug. For example, an antihistaminic or an antipyretic or anti anginal or pain killer, anti-inflammatory or so.

    Doxycycline Anatomical Therapeutic Chemical codes:

    A medicine is classified depending on the organ or system it acts [Anatomical], based on what result it gives on what disease, symptom [Therapeutical], based on chemical composition [Chemical]. It is called as ATC code. The code is based on Active ingredients of the medicine. A medicine can have different codes as sometimes it acts on different organs for different indications. Same way, different brands with same active ingredients and same indications can have same ATC code.

    Doxycycline pharmaceutical companies:

    Pharmaceutical companies are drug manufacturing companies that help in complete development of the drug from the background research to formation, clinical trials, release of the drug into the market and marketing of the drug.
    Researchers are the persons who are responsible for the scientific research and is responsible for all the background clinical trials that resulted in the development of the drug.



    1. Dailymed."ORACEA (DOXYCYCLINE) CAPSULE [GALDERMA LABORATORIES, L.P.]". (accessed August 28, 2018).
    2. Dailymed."DOXYCYCLINE: DailyMed provides trustworthy information about marketed drugs in the United States. DailyMed is the official provider of FDA label information (package inserts).". (accessed August 28, 2018).
    3. "doxycycline". (accessed August 28, 2018).

    Frequently asked Questions

    Can i drive or operate heavy machine after consuming Doxycycline?

    Depending on the reaction of the Doxycycline after taken, if you are feeling dizziness, drowsiness or any weakness as a reaction on your body, Then consider Doxycycline not safe to drive or operate heavy machine after consumption. Meaning that, do not drive or operate heavy duty machines after taking the capsule if the capsule has a strange reaction on your body like dizziness, drowsiness. As prescribed by a pharmacist, it is dangerous to take alcohol while taking medicines as it exposed patients to drowsiness and health risk. Please take note of such effect most especially when taking Primosa capsule. It's advisable to consult your doctor on time for a proper recommendation and medical consultations.

    Is Doxycycline addictive or habit forming?

    Medicines are not designed with the mind of creating an addiction or abuse on the health of the users. Addictive Medicine is categorically called Controlled substances by the government. For instance, Schedule H or X in India and schedule II-V in the US are controlled substances.

    Please consult the medicine instruction manual on how to use and ensure it is not a controlled substance.In conclusion, self medication is a killer to your health. Consult your doctor for a proper prescription, recommendation, and guidiance.


    Review conducted a study on Doxycycline, and the result of the survey is set out below. It is noteworthy that the product of the survey is based on the perception and impressions of the visitors of the website as well as the views of Doxycycline consumers. We, as a result of this, advice that you do not base your therapeutic or medical decisions on this result, but rather consult your certified medical experts for their recommendations.

    Visitor reports

    Visitor reported useful

    No survey data has been collected yet

    Visitor reported side effects

    No survey data has been collected yet

    Two visitors reported price estimates

    What is your opinion about drug cost? Did you feel the cost is apt, or did you feel it is expensive?
    The report given by the website users shows the following figures about several people who felt the medicine Doxycycline is expensive, and the medicine is not expensive. The results are mixed. The perception of the cost of the medicine to be expensive or not depends on the brand name of the medicine, country, and place where it is sold, and the affordability of the patient. You can choose a generic drug in the place of the branded drug to save the cost. The efficiency of the medicine will not vary if it is generic or a branded one.
    Not expensive1

    One visitor reported frequency of use

    How often in a day do you take the medicine?
    Are you taking the Doxycycline drug as prescribed by the doctor?

    Few medications can be taken Twice in a day more than prescribed when the doctor's advice mentions the medicine can be taken according to frequency or severity of symptoms. Most times, be very careful and clear about the number of times you are taking the medication. The report of website users about the frequency of taking the drug Doxycycline is mentioned below.
    Twice in a day1

    One visitor reported doses

    What is the dose of Doxycycline drug you are taking?
    According to the survey conducted among website users, the maximum number of people are using the following dose 51-100mg. Few medications come in only one or two doses. Few are specific for adult dose and child dose. The dose of the medicine given to the patient depends on the severity of the symptom/disease. There can be dose adjustments made by the doctor, based on the progression of the disease. Follow-up is important.

    Two visitors reported time for results

    What is the time duration Doxycycline drug must be taken for it to be effective or for it to reduce the symptoms?
    Most chronic conditions need at least some time so the dose and the drug action gets adjusted to the body to get the desired effect. The stastistics say website users needed 1 week to notice the result from using Doxycycline drug. The time needed to show improvement in health condition after using the medicine Doxycycline need not be same for all the users. It varies based on other factors.
    1 week2

    One visitor reported administration

    The drugs are administered in various routes, like oral or injection form. They are administered before food or after food. How are you taking Doxycycline drug, before food or after food?
    Click here to find out how other users of our website are taking it. For any doubts or queries on how and when the medicine is administered, contact your health care provider immediately.
    Empty stomach1

    Two visitors reported age


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    The information was verified by Dr. Rachana Salvi, MD Pharmacology

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