Drug Interaction Checker

Find out if your medicines are safe to take together.

1 Add each medicine you take: the brand on the box or the medicine inside it.
2 We check every pair, including each ingredient of combination medicines.
3 See what could happen and what to do, in plain language.

Your medicines

Take these together with care

We found interactions that usually need care rather than stopping a medicine. Your doctor may adjust a dose or check on you more often.

1 Moderate 1 pair checked

1 interaction

Nelvir Nelfinavir Dienogest

Moderate

Nelfinavir is a protease inhibitor, and it can block CYP3A4, the liver enzyme that breaks down Dienogest. Because of this, more Dienogest may stay in your blood than normal, and this can cause more side effects. Other medicines that also block CYP3A4 can do the same. These include azole antifungals (ketoconazole, itraconazole, fluconazole), cimetidine, verapamil, macrolide antibiotics (erythromycin, clarithromycin, roxithromycin), diltiazem, other protease inhibitors (ritonavir, saquinavir, indinavir) and some antidepressants (nefazodone, fluvoxamine, fluoxetine). If you need to take Nelfinavir with Dienogest, talk to your doctor or pharmacist first.

What should I do?

These medicines are often taken together with some care. Your doctor may change a dose, space them apart or check on you more often. Make sure your doctor and pharmacist know you take both.

Feeling unwell after taking your medicines? For an emergency call 999. For free advice from a doctor, call the 16263 health line (Shasthya Batayon), any time.

What do Major, Moderate and Minor mean?

Major

The combination can cause serious harm or stop a medicine from working. Usually avoided, or only used with close medical supervision.

Moderate

The combination may need care: a different dose, taking them at different times, or extra check-ups.

Minor

Little or no effect is expected. Usually nothing needs to change.

Duplicate

Two of your medicines contain the same ingredient, which can add up to a double dose.

Important: This checker lists interactions found in medicine leaflets and may not be complete. It does not know your dose, your health conditions, or food and supplement interactions. Never start, stop or change a medicine because of this tool alone: ask a registered doctor or pharmacist.