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Doxycin Cap 100mg: Uses, Side Effects and Dosage

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Facts
Status:
Prescription (Rx)
Strength:
100 mg
Active ingredient:
ATC code:
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Source: Health Canada – Drug Product Database (DPD) and product monographs · About this document

Patient Medication Information: uses, side effects, how to take - Doxycin Cap 100mg

What DOXYCIN CAPSULES / DOXYCIN TABLETS is used for:

  • DOXYCIN CAPSULES / DOXYCIN TABLETS is used to treat infections caused by germs (bacteria).
  • DOXYCIN CAPSULES / DOXYCIN TABLETS is NOT used to treat viral infections (e.g. the common cold).

Antibacterial drugs like DOXYCIN CAPSULES / DOXYCIN TABLETS treat only bacterial infections. They do not treat viral infections such as the common cold.

How DOXYCIN CAPSULES / DOXYCIN TABLETS works:

DOXYCIN CAPSULES / DOXYCIN TABLETS is an antibiotic. It stops the bacteria’s ability to make what it needs to grow new cells. This helps get rid of the infection.

The ingredients in DOXYCIN CAPSULES / DOXYCIN TABLETS are:

Medicinal ingredients: DOXYCIN CAPSULES / DOXYCIN TABLETS: doxycycline hyclate.

Non-medicinal ingredients:

DOXYCIN CAPSULES: Allura Red AC (FD&C Red No. 40), Brilliant Blue FCF sodium salt (FD&C Blue No. 1), Colloidal silicon dioxide, Gelatin, Indigo Carmine (FD&C Blue No. 2), Iron oxide black, Lactose, Magnesium stearate, Microcrystalline cellulose, Propylene glycol, Quinoline Yellow WS (D&C Yellow No. 10), Shellac, Stearic acid and Titanium dioxide.

DOXYCIN TABLETS: Carnauba wax, Colloidal silicon dioxide, Iron oxide yellow, Magnesium stearate, Microcrystalline cellulose, Polyethylene glycol, Polyvinyl alcohol, Sodium starch glycolate, Starch, Stearic acid, Sunset Yellow FCF (FD&C Yellow No. 6), Talc and Titanium dioxide.

DOXYCIN CAPSULES / DOXYCIN TABLETS comes in the following dosage forms:

DOXYCIN CAPSULES 100 mg capsules

DOXYCIN TABLETS 100 mg Film-coated tablets

Do not use DOXYCIN CAPSULES / DOXYCIN TABLETS if:

  • You are allergic to this drug.
  • You are allergic to any of the ingredients in these products. See also “The ingredients in DOXYCIN CAPSULES / DOXYCIN TABLETS are” above.
  • You are allergic to tetracycline drugs (a class of antibiotics).
  • You have myasthenia gravis (a muscle disease).
  • You are taking isotretinoin (e.g. Accutane). See the next section, “To help avoid side effects and ensure proper use”.

To help avoid side effects and ensure proper use, talk to your healthcare professional before you take DOXYCIN CAPSULES / DOXYCIN TABLETS. Talk about any health conditions or problems you may have, including if you:

  • are pregnant or plan to become pregnant.

  • are breastfeeding or planning to breastfeed. Some of this drug may pass to your baby.
  • DOXYCIN CAPSULES / DOXYCIN TABLETS are not recommended for women who are breastfeeding.
  • have trouble swallowing.
  • have health problems that affect or block the tube that carries food from your mouth to your stomach (esophagus).

Other warnings you should know about:

  • DOXYCIN CAPSULES / DOXYCIN TABLETS may increase your sensitivity to light. Minimize or avoid exposure to natural or artificial sunlight while taking DOXYCIN CAPSULES / DOXYCIN TABLETS. Wear sunscreen or cover your skin when sunlight exposure cannot be avoided. Stop taking DOXYCIN CAPSULES / DOXYCIN TABLETS if you get a sunburn.
  • Tetracyclines such as DOXYCIN CAPSULES / DOXYCIN TABLETS may cause a serious side effect, benign intracranial hypertension (pressure around the brain) with symptoms such as headache, nausea, vomiting and vision loss. If this occurs, contact your healthcare professional immediately. Do not use DOXYCIN CAPSULES / DOXYCIN TABLETS and isotretinoin together as they both can cause this effect.

Tell your healthcare professional about all the medicines you take, including any drugs, vitamins, minerals, natural supplements or alternative medicines.

The following may also interact with DOXYCIN CAPSULES / DOXYCIN TABLETS:

Do not take DOXYCIN CAPSULES / DOXYCIN TABLETS with:

  • alcohol.
  • barbiturates (drugs that help you sleep).
  • phenytoin (a drug that controls epilepsy).
  • carbamazepine (a drug that controls epilepsy).
  • rifampin (an antibiotic that is used to treat or prevent tuberculosis).
  • methoxyflurane (an anaesthetic).
  • Some drugs can make DOXYCIN CAPSULES / DOXYCIN TABLETS not work as well as they should. These include:
  • drugs to thin the blood (oral anticoagulants).
  • penicillin, a drug to treat infections.
  • drugs to treat upset stomach that contain bismuth subsalicylate.
  • drugs to treat heartburn that contain aluminum, calcium or magnesium.
  • products that contain iron.
  • Do not take these drugs at the same time of day as DOXYCIN CAPSULES / DOXYCIN TABLETS.
  • Birth control pills may not work if you are on them while taking DOXYCIN CAPSULES / DOXYCIN TABLETS. You should use other birth control while taking these products and for 7 days after stopping.

How to take DOXYCIN CAPSULES / DOXYCIN TABLETS:

  • Although you may feel better early in treatment, DOXYCIN CAPSULES / DOXYCIN TABLETS should be used exactly as directed.
  • Misuse or overuse of DOXYCIN CAPSULES / DOXYCIN TABLETS could lead to the growth of bacteria that will not be killed by DOXYCIN CAPSULES / DOXYCIN TABLETS (resistance). This means that DOXYCIN CAPSULES / DOXYCIN TABLETS may not work for you in the future.
  • Do not share your medicine.
  • Take DOXYCIN CAPSULES / DOXYCIN TABLETS with or after eating a meal.
  • Take DOXYCIN CAPSULES / DOXYCIN TABLETS with a glass of water.
  • Stay upright for 1 to 2 hours after taking DOXYCIN CAPSULES / DOXYCIN TABLETS.

Usual adult dose:

Take 2 capsules or tablets for your first dose. Starting on the next day, take 1 capsule or tablet daily. Your healthcare professional may change your dose based on your infection.

Overdose:

If you think you, or a person you are caring for, have taken too much DOXYCIN CAPSULES / DOXYCIN TABLETS, contact a healthcare professional, hospital emergency department, regional poison control centre or Health Canada’s toll-free number, 1-844 POISON-X (1-844-764-7669) immediately, even if there are no signs or symptoms.

Missed Dose:

If you missed a dose of this medication, take it as soon as you remember. But if it is almost time for your next dose, skip the missed dose and continue with your next scheduled dose. Go back to the regular dosing schedule. Do not take two doses at the same time.

Possible side effects from using DOXYCIN CAPSULES / DOXYCIN TABLETS:

These are not all the possible side effects you have when taking DOXYCIN CAPSULES / DOXYCIN TABLETS. If you experience any side effects not listed here, tell your healthcare professional.

Side effects that may occur while using DOXYCIN CAPSULES / DOXYCIN TABLETS:

  • change in tooth colour.
  • diarrhea.
  • loss of appetite.
  • nausea.
  • stomach pain.
  • vomiting.

Serious side effects and what to do about them

Frequency/Side Effect/SymptomTalk to your healthcare professionalStop taking drug and get immediate medical help
Only if severeIn all cases
Unknown
Pain or difficulty swallowing✓
Rash✓
Yeast infection✓

Hypersensitivity (allergic) reaction

Symptoms are:

  • difficulty breathing
  • fast heartbeat
  • dizziness
  • itching
  • rash
  • skin blistering
✓

Autoimmune adverse drug reactions.

Symptoms are:

  • swelling of hands and feet
  • muscle and joint pain
  • rash
✓

Benign intracranial hypertension (high blood pressure in the brain). Symptoms are:

  • headache
  • nausea
  • vomiting
  • visual disturbances (e.g. blurred vision, double vision, blank spots)
✓
Clostridium difficile colitis (bowel inflammation): severe diarrhea (bloody or watery) with or without fever, abdominal pain, or tenderness✓

Suicidal thoughts:

  • Thoughts or actions about hurting or killing yourself
✓

If you have a troublesome symptom or side effect that is not listed here or becomes bad enough to interfere with your daily activities, talk to your healthcare professional.

Reporting side effects

You can report any suspected side effects associated with the use of health products to Health Canada by:

  • Visiting the Web page on Adverse Reaction Reporting (canada.ca/drug-device-reporting) for information on how to report online, by mail or by fax; or
  • Calling toll-free at 1-866-234-2345.

NOTE: Contact your healthcare professional if you need information about how to manage your side effects. The Canada Vigilance Program does not provide medical advice.

Storage:

Store at controlled room temperature (15-30°C) protect from light and humidity.

Keep out of reach and sight of children.

If you want more information about DOXYCIN CAPSULES / DOXYCIN TABLETS:

  • Talk to your healthcare professional.
  • Find the full product monograph that is prepared for healthcare professionals and includes the Patient Medication Information by visiting the Health Canada Drug Product Database website (https://www.canada.ca/en/health-canada/services/drugs-health-products/drug-products/drug-product-database.html); the manufacturer’s website (www.labriva.com); or by calling 1-800-363-7988.

660 Industriel Blvd

Blainville, Quebec

J7C 3V4

www.labriva.com

Date of Authorization: 2026-10-09

About this document

Source: Health Canada – Drug Product Database (DPD) and product monographs · DIN (Drug Identification Number): 00817120

Approved according to the text: October 9, 2026

Found a mistake? Write to us via the contact page.

The information on this site does not replace the advice of a doctor or pharmacist.

Drug information for Doxycin Cap 100mg

Rx or OTC
Prescription (Rx)?
DIN 00817120, 00860751
Schedule(s) PRESCRIPTION
Active ingredient(s) Doxycycline (doxycycline hyclate) 100 MG
Dosage form(s) Capsule, Tablet
Route(s) of administration Oral
Drug class (WHO ATC)
  1. J Antiinfectives for systemic use
    1. J01 Antibacterials for systemic use
      1. J01A Tetracycline antibiotics
        1. J01AA Tetracyclines
          1. J01AA02 Doxycycline
Company LABORATOIRE RIVA INC.
Strengths and forms
DIN Strength Dosage form(s) Current status
00817120 100 MG Capsule Dormant July 5, 2017
00860751 100 MG Tablet Marketed December 31, 1989

Source: Health Canada – Drug Product Database (DPD) and product monographs, data as of November 1, 2026. Data from the Health Canada Drug Product Database, as published there. Not a substitute for the advice of a doctor or pharmacist.