Tinidazole

What Is Tinidazole?

Tinidazole is a prescription antimicrobial medicine. It belongs to a group called nitroimidazoles, which treat infections caused by certain parasites (protozoa) and certain bacteria that grow without oxygen (anaerobic bacteria). It is related to metronidazole and ornidazole. It is sold under the brand name Tindamax in the United States and as generic versions.

FDA-Approved Uses

Tinidazole is approved to treat:

• Trichomoniasis, a sexually transmitted infection of the urogenital tract caused by Trichomonas vaginalis, in patients and their sexual partners
• Giardiasis, an intestinal infection caused by Giardia
• Amebiasis, including intestinal infection and amebic liver abscess caused by Entamoeba histolytica
• Bacterial vaginosis in adult women who are not pregnant

Other Prescribed Uses

Specialists sometimes prescribe tinidazole for other anaerobic or protozoal infections, or for other situations, based on individual circumstances. These decisions belong to the treating specialist.

Available Forms and Strengths

• Tablets: commonly Tinidazole 300mg, Tinidazole 500mg

Some pharmacies can prepare a liquid form from crushed tablets for patients who cannot swallow tablets, such as young children. Available forms and strengths can vary by manufacturer and country.

What Is the Recommended Dosage of Tinidazole?

There is no single dose that fits everyone. The prescribed dose and length of treatment depend on several factors:

• The condition being treated. Trichomoniasis and giardiasis are often treated with a single dose. Amebiasis and bacterial vaginosis usually need treatment for several days.
• Age. Children are dosed by body weight. Safety and effectiveness have been established for some infections in children older than 3 years, but not for others.
• Body weight.
• Liver function. People with severe liver disease may need a different dose or closer monitoring.
• Kidney function. Dose changes are usually not needed for reduced kidney function, but patients on hemodialysis may need an extra dose after dialysis.
• Sexual partners. For trichomoniasis, sexual partners are usually treated at the same time.

Tablets should be taken with food to reduce stomach upset. For people who have trouble swallowing tablets, a pharmacist can advise on how to take the medicine, often by mixing crushed tablets with a sweet liquid or syrup.

Always take tinidazole exactly as your licensed medical specialist or pharmacist instructs. Do not change the dose, stop early, or extend treatment on your own, even if symptoms improve. Stopping too soon can allow the infection to return.

How Tinidazole Works

Tinidazole enters certain parasites and anaerobic bacteria. Inside these organisms, it is chemically changed into reactive forms that damage the organism’s genetic material (DNA). This stops the organism from surviving and multiplying. Human cells and organisms that use oxygen do not change tinidazole in the same way, which is why it targets these specific germs.

Tinidazole treats infections caused by susceptible organisms, and it helps the body clear the infection. How well it works depends on the type of organism, the location of the infection, and the person’s overall health. It does not work against viral infections, fungal infections, or bacteria that need oxygen to grow.

Is a Prescription Required to Buy Tinidazole Online?

In the United States, tinidazole is a prescription-only medicine. A licensed healthcare professional must evaluate you before it is prescribed.

Depending on the infection, the specialist may be:

• A primary care physician
• A gynecologist (for vaginal infections)
• A urologist (for genital infections in men)
• An infectious disease specialist (for parasitic, recurrent, or complicated infections)
• A gastroenterologist (for intestinal infections)

Only buy tinidazole from a licensed pharmacy that requires a valid prescription. Be careful with websites that sell it without one. Counterfeit, expired, or improperly stored products can be unsafe. Products labeled for animals are not approved for people and should never be used.

Side Effects of Tinidazole

Most people tolerate tinidazole well, but side effects can occur.

Common Side Effects

• Metallic or bitter taste in the mouth
• Nausea or vomiting
• Loss of appetite
• Stomach pain or upset stomach
• Weakness or tiredness
• Headache
• Dizziness
• Constipation or diarrhea

These are often mild. Talk to your pharmacist or doctor if they bother you or do not go away.

Serious Side Effects

Serious reactions are uncommon but possible. Get medical help right away if you notice:

• Numbness, tingling, burning, or weakness in the hands or feet (possible nerve problems)
• Seizures, confusion, severe dizziness, loss of balance, or trouble speaking
• Swelling of the face, lips, tongue, or throat, or trouble breathing (allergic reaction)
• Severe skin reactions, such as blistering, peeling, or sores in the mouth
• Fever, sore throat, or unusual bruising or bleeding (possible blood count changes)
• Yellowing of the skin or eyes, dark urine with pale stools, or severe stomach pain (possible liver problems)
• Severe or lasting diarrhea, which can be a sign of a bowel infection from antibiotic use
• A vaginal yeast infection that develops or worsens during treatment
• Severe mood changes or hallucinations

Call emergency services if you have trouble breathing or think you are having a life-threatening reaction.

Drug Interactions

Tinidazole can change how some other medicines work, and some medicines can change how the body handles tinidazole. Major categories include:

• Alcohol. Avoid alcohol during treatment and for at least 3 days (72 hours) after the last dose. Combining alcohol with tinidazole can cause flushing, nausea, vomiting, headache, and a fast heartbeat.
• Disulfiram, used to treat alcohol dependence. It should not be used during or within 2 weeks of taking tinidazole because of the risk of confusion and psychosis.
• Blood thinners (such as warfarin), which may increase bleeding risk. Blood tests are often used to adjust the dose.
• Lithium, since tinidazole may raise lithium levels
• Fluorouracil (5-FU) and busulfan, cancer medicines whose levels may increase
• Phenytoin, phenobarbital, and other seizure medicines, which may change levels of tinidazole or the other medicine
• Rifampin, an antibiotic that can lower tinidazole levels
• Cimetidine, a stomach acid medicine that may raise tinidazole levels
• Ketoconazole, an antifungal that may raise tinidazole levels
• Cyclosporine and tacrolimus, immune-suppressing medicines whose levels may rise
• Medicines that affect heart rhythm, since tinidazole may add to this effect in some people

Tell your provider about all over-the-counter medicines, vitamins, supplements, and herbal products. Also mention any products that contain alcohol, such as some liquid cough and cold medicines, mouthwashes, and tonics.

Give your licensed medical specialist and pharmacist a complete, up-to-date list of everything you take. This list is not complete, so always check before starting or stopping any medicine.

Safety & Important Considerations

• FDA boxed warning (cancer risk in animals): Long-term use of metronidazole, a closely related medicine, has been linked to cancer in rats and mice. It is not known whether tinidazole carries the same risk in humans, but the FDA advises avoiding unnecessary use and reserving it for conditions where it is needed.
• Nervous system conditions: Tinidazole can cause nerve-related side effects, including numbness and seizures. It is used with caution in people with existing brain or nerve disorders. Report new numbness, tingling, or balance problems promptly.
• Blood disorders: Use caution in people with a current or past blood disorder. Blood counts may be checked, especially with longer or repeated treatment.
• Liver disease: Tinidazole is processed by the liver. People with severe liver disease may need dose changes and closer monitoring.
• Kidney disease: Dose changes are usually not needed, but dialysis can remove the medicine from the blood, so timing of doses may matter.
• Alcohol: Avoid alcohol during treatment and for at least 3 days afterward.
• Yeast infections: Tinidazole can allow yeast to overgrow. Tell your provider if you develop new vaginal or mouth symptoms.
• Pregnancy: Tinidazole is generally avoided in the first trimester, and later use is decided by weighing the benefits and risks. Tell your provider if you are pregnant, may become pregnant, or are trying to conceive.
• Breastfeeding: Tinidazole passes into breast milk. Breastfeeding is usually paused during treatment and for 3 days after the last dose. Your provider may advise pumping and discarding the milk during this time.
• Children: Tinidazole is used in children for certain infections, with weight-based dosing determined by a specialist. It is not approved for bacterial vaginosis or trichomoniasis in children.
• Older adults: Older adults may be more sensitive to nervous system effects and often take multiple medicines, which raises the chance of interactions.
• Driving and machinery: Tinidazole can cause dizziness or weakness. Use caution until you know how it affects you.
• Sexual partners: For trichomoniasis, follow your specialist’s advice about treating partners and avoiding sexual contact until treatment is complete.

Who This Medication Is For

Tinidazole is prescribed for adults and, for certain infections, children who have a confirmed or strongly suspected infection caused by a susceptible parasite or anaerobic bacterium, within its approved indications. Whether it is appropriate depends on the type of infection, medical history, other medicines, and test results.

Who Should Not Take Tinidazole

Tinidazole is not suitable for everyone. Do not take it if:

• You have had an allergic reaction to tinidazole. Tell your provider if you have reacted to other nitroimidazoles such as metronidazole, ornidazole, or secnidazole, since cross-reactions can occur.
• You are in the first trimester of pregnancy, unless your specialist decides the benefit outweighs the risk.
• You are taking disulfiram, or have taken it in the past 2 weeks.
• You have recently used alcohol, or plan to drink alcohol, during treatment or within 3 days after the last dose.

Use extra caution and discuss risks with your provider if you have:

• Liver disease
• Nerve or brain disorders, including a history of seizures
• A history of blood disorders
• Kidney disease requiring dialysis
• Pregnancy, plans for pregnancy, or breastfeeding
• A history of a serious allergic reaction to medicines
• Regular alcohol use

What to Do If You Miss a Dose

• Take the missed dose as soon as you remember, and take it with food.
• If it is almost time for your next dose, skip the missed one and go back to your regular schedule.
• Do not take two doses at once to make up for a missed dose.
• If you are unsure what to do, or you are taking a single-dose or short regimen, contact your licensed medical specialist or pharmacist. Missed doses can affect how well the infection is treated.

Related medications to Tinidazole

Other medicines exist for these infections, and the right one depends on the type and location of the infection. Only a licensed specialist can decide whether a different medicine is appropriate.

Other nitroimidazoles (same class):

• Metronidazole
• Secnidazole
• Ornidazole (not FDA-approved in the United States)

Medicines from other classes, depending on the infection:

• Nitazoxanide, used for some intestinal parasite infections such as giardiasis
• Paromomycin and iodoquinol, used for some intestinal parasite infections
• Clindamycin, used for bacterial vaginosis and some anaerobic infections
• Other antibiotics chosen by a specialist based on the bacteria involved

Do not switch or stop tinidazole without talking to your licensed medical specialist.

Storage Instructions

• Tablets: Store at room temperature, generally between 68°F and 77°F (20°C and 25°C), in the original container. Keep them dry and protected from moisture and light. Avoid storing them in a bathroom.
• Pharmacy-prepared liquid (if prescribed): Follow the pharmacy label for storage and for how long to keep it. Shake well before each use if directed.
• Child safety: Keep all medicines out of reach and sight of children and pets, preferably in a locked or high cabinet.
• Do not use medicine past its expiration date. Ask your pharmacist about safe disposal of unused or expired medicine.

Disclaimer:

This page is for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Patients must consult a licensed medical specialist, such as a primary care physician, gynecologist, infectious disease specialist, or gastroenterologist, depending on the type of infection, before starting, changing, or stopping treatment. Treatment decisions must be based on a full clinical evaluation by a qualified specialist. Information about dosing, strengths, and safety may change, so always follow the guidance of your prescriber and the current product labeling.