What is a Generic Drug?

A generic drug is a copy of the brand-name drug with the same dosage, safety, strength, quality, consumption method, performance, and intended use. Before generics become available on the market, the generic company must prove it has the same active ingredients as the brand-name drug and works in the same way and in the same amount of time in the body.

The only differences between generics and their brand-name counterparts is that generics are less expensive and may look slightly different (eg. different shape or color), as trademarks laws prevent a generic from looking exactly like the brand-name drug.

Generics are less expensive because generic manufacturers don't have to invest large sums of money to develop a drug. When the brand-name patent expires, generic companies can manufacture a copy of the brand-name and sell it at a substantial discount.

Fasigyn (Tinidazole)


Fasigyn (Tinidazole)

Prescription Required


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  • Product Details


    Fasigyn is a prescription medication your doctor may give for the treatment of either a bacterial or parasitic infection. It can treat the following:

    • Amebiasis in patients three years and older
    • Bacterial vaginosis in non-pregnant adult women
    • Giardiasis in patients three years and older
    • Trichomoniasis

    Fasigyn enters the infective organism and damages DNA to prevent cellular replication. This process helps to prevent further infection and allows the body to fight the organism.

    Fact Table




    US FDA



    Legal status


    Chemical Name


    Elimination half-life

    12-14 hours

    Dosage (Strength)



    Consult Doctor


    Fasigyn, Simplotan, Tindamax

    Protein binding


    PubChem CID






    ATC code






    Routes of administration



    The dosage will be determined by your healthcare provider, depending on the disease being treated.


    The active ingredient in Fasigyn is tinidazole.


    Common drug-drug interactions with this medication can include:

    • Alcohol
    • Bacillus clausii
    • BCG (Intravesical)
    • BCG Vaccine
    • Cholera Vaccine
    • Disulfiram
    • Immune Checkpoint Inhibitors
    • Lactobacillus and Estriol
    • Sodium Picosulfate
    • Typhoid Vaccine


    Do not take Fasgyn for longer than prescribed. A similar medication has shown carcinogenicity in animal trials.

    Tell your doctor if you have a history of seizures or peripheral neuropathy.

    Use with caution if you have a history of blood disorders.

    Tell your doctor if you have a history of liver problems before starting this drug.

    Side Effects

    The most common adverse reactions may include the following. Tell your doctor or pharmacist if you experience any of these:

    • Abdominal cramps
    • Abdominal pain
    • Angioedema
    • Anorexia
    • Arthralgia
    • Arthritis
    • Asthenia
    • Ataxia
    • Bitter taste
    • Bronchospasm
    • Burning sensation
    • Candidiasis
    • Coma
    • Confusion
    • Constipation
    • Dark urine
    • Decreased appetite
    • Depression
    • Diaphoresis
    • Diarrhea
    • Dizziness
    • Drowsiness
    • Dysgeusia
    • Dyspepsia
    • Dyspnea
    • Dysuria
    • Epigastric discomfort
    • Erythema multiforme
    • Fatigue
    • Fever
    • Flatulence 
    • Flushing
    • Hairy tongue
    • Headache
    • Heavy menstrual bleeding
    • Hypersensitivity reaction
    • Increased serum transaminases
    • Increased thirst
    • Insomnia
    • Leukopenia
    • Malaise
    • Metallic taste
    • Myalgia
    • Nausea
    • Neutropenia
    • Oral candidiasis
    • Palpitations
    • Pelvic pain
    • Peripheral neuropathy
    • Pharyngitis
    • Pruritus
    • Salivation
    • Seizure
    • Skin rash
    • Stevens-Johnson syndrome
    • Stomatitis
    • Thrombocytopenia
    • Tongue discoloration
    • Upper respiratory tract infection
    • Urinary tract infection
    • Urine abnormality
    • Urticaria
    • Vaginal discharge
    • Vertigo
    • Vomiting
    • Vulvovaginal candidiasis
    • Vulvovaginal disease
    • Xerostomia


    Tinidazole [package insert]. San Antonio, TX: Mission Pharmacal Company; 2004.

    Frequently Asked Questions about Fasigyn (Tinidazole)

    What is Fasigyn used for?

    Fasigyn is used to treat certain infections of the genital systems, liver, and bowel, as well as to prevent infections that may occur during surgery.

    How does Fasigyn work?

    Fasigyn, a synthetic antiprotozoal agent, damages DNA strands or inhibits DNA synthesis in microorganisms, helping the body fight infections caused by bacteria and parasites.

    What is the active ingredient in Fasigyn?

    The active ingredient in Fasigyn is Tinidazole.

    Is Fasigyn effective?

    Fasigyn is effective if used in the dose and duration advised by your doctor.

    What type of infections can Fasigyn treat?

    Fasigyn can treat infections of the liver, stomach, intestines, vagina, brain, heart, lungs, and skin. It is also used for dental infections, leg ulcers, and pressure sores.

    How should Fasigyn be taken?

    Fasigyn should be taken with food, during or immediately after meals. The specific dosage depends on the type of infection being treated.

    What are the common side effects of Fasigyn?

    Common side effects include nausea, vomiting, anorexia, diarrhea, metallic taste, headache, and tiredness.

    Can Fasigyn be used for dental infections?

    Yes, Fasigyn can be used for the treatment of dental infections.

    Is Fasigyn available over the counter?

    No, Fasigyn is available by prescription only.

    Which pharmaceutical company manufactures Fasigyn?

    Fasigyn is manufactured by Pfizer Ltd.

    IMPORTANT NOTE: The above information is intended to increase awareness of health information and does not suggest treatment or diagnosis. This information is not a substitute for individual medical attention and should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. See your health care professional for medical advice and treatment.

    Product Code : 9721

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