
Alcarex Eye Drops
Ajanta Pharma - Drop - 0.5%W/V - 5 ml
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Tapentadol
Available at our pharmacy counter
This medicine is dispensed in person against a valid prescription and is not sold online. Ask our pharmacist about availability, or speak to a registered doctor.
In-store reference price ₹362
Tapenax ER 100 mg is used for this medicine is used in the treatment of pain, inflammation, arthritis, fever and period pain.
Medically reviewed by Dr. Balaji Krishnan, MBBS · Updated September 2026
Tapenax ER 100 mg contains Tapentadol. It belongs to the Opioid analgesic class of medicines.
Tapentadol blocks the chemicals your body makes at a site of injury or inflammation, which reduces pain, swelling and fever.
Use this medicine as your doctor has directed. Follow the dose and the duration written on your prescription.
Take it exactly as your doctor prescribed. Do not change the dose or stop early on your own.
Take it as soon as you remember. If your next dose is almost due, skip the one you missed — never take two doses together to catch up.
An overdose of this medicine can dangerously slow or stop breathing — this is a medical emergency. Do not wait for symptoms to appear — go to the nearest emergency department and take the pack or strip with you.
Most side effects of Tapenax ER are mild and settle as the body adjusts. Reported side effects include:
Stop the medicine and seek help immediately for a rash, swelling of the face or lips, wheezing or difficulty breathing. Tell your doctor about any side effect that persists or worries you.
| Pregnancy | Not recommended in pregnancy — it may harm the developing baby. Tell your doctor at once if you are or might be pregnant. |
|---|---|
| Breastfeeding | Use with caution while breastfeeding; watch the baby for any unusual symptoms. |
| Alcohol | Do not drink alcohol while taking this medicine. |
| Driving | Do not drive or operate machinery while taking this medicine. |
| Kidney | Consult your doctor if you have kidney disease. |
| Liver | Consult your doctor if you have liver disease. |
| Habit forming | Yes |
Take it with or just after food, and for the shortest time that works. Stop and seek urgent care for black or tarry stools, vomiting blood, or severe stomach pain — this group can cause bleeding from the stomach. Long or high-dose use raises the risk of heart attack, stroke and kidney injury, particularly in older people and those already at risk. Avoid if you are dehydrated or have an illness with vomiting or loose motions — the kidneys are vulnerable then. Must be avoided in the last three months of pregnancy. This is an opioid painkiller. It can cause dependence, and should be taken only for the period your doctor has specified. Never combine it with alcohol, sleeping tablets or other sedatives — together they can dangerously slow your breathing. Do not stop a long course abruptly; your doctor will reduce it gradually.
Not for anyone with a known allergy to this medicine or to any ingredient in the pack. Not for people with an active stomach ulcer, severe kidney or heart failure, or asthma triggered by aspirin or anti-inflammatory painkillers. Not in the third trimester of pregnancy.
Combining with a blood thinner or aspirin sharply raises the bleeding risk. Reduces the effect of blood pressure medicines and water tablets, and together with them can harm the kidneys. Never take two anti-inflammatory painkillers at the same time.
Store below 30°C in the original pack, away from direct sunlight and moisture. Keep out of the reach of children.
Use the lowest dose for the shortest period. If you need a painkiller regularly, see your doctor rather than continuing on your own. Paracetamol is the safer choice for simple fever and headache.

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The information on Tapenax ER 100 mg is compiled from the manufacturer's prescribing information and the sources below, and is reviewed by a registered medical practitioner. It does not replace advice from your own doctor.