• Basic Info
• Top Questions
• Clinical Info
• Interactions

Before taking loperamide, tell your doctor if you are also taking saquinavir (Invirase).

There may be other drugs that can interact with loperamide. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using this medication and call your doctor at once if you have any of these serious side effects:

• stomach pain or bloating;

• ongoing or worsening diarrhea;

• diarrhea that is watery or bloody; or

• fever, sore throat, and headache with a severe blistering, peeling, and red skin rash.

Less serious side effects may include:

• dizziness;

• drowsiness, tired feeling;

• constipation;

• mild stomach pain; or

• mild skin rash or itching.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.