Many medications can cause side effects. A side effect is an unwanted response to a medication when it is taken in normal doses. Side effects can be mild or severe, temporary or permanent.

The side effects listed below are not experienced by everyone who takes Temodal (Temozolomide). If you are concerned about side effects, discuss the risks and benefits of Temodal (Temozolomide) with your doctor.

The following side effects have been reported by at least 1% of people taking Temodal (Temozolomide). Many of these side effects can be managed, and some may go away on their own over time.

Contact your doctor if you experience these side effects and they are severe or bothersome. Your pharmacist may be able to advise you on managing side effects.

• abdominal pain
• blurred vision
• changes in taste perception
• Constipation
• Diarrhea
• dizziness
• drowsiness
• fatigue
• hair loss
• headache
• itching
• joint pain
• lack of energy
• loss of appetite
• muscle weakness
• nausea
• rash
• tingling sensation
• trouble sleeping
• weakness
• weight loss
• vomiting

Although most of the side effects listed below don't happen very often, they could lead to serious problems if you do not seek medical attention.

Check with your doctor as soon as possible if any of the following side effects occur:

• anxiety
• burning, prickling, or tingling sensations in the hands or feet
• confusion
• difficulty speaking
• hearing impairment
• increased blood sugar (e.g., frequent urination, increased thirst, excessive eating, unexplained weight loss, poor wound healing, infections, fruity breath odour)
• memory problems
• mouth sores or inflammation
• pain, bruising, irritation, itching, warmth, swelling, or redness at the injection site
• rapid mood changes
• rash with skin swelling, including on the palms of the hands and soles of the feet (if you are not having difficulty breathing)
• shortness of breath and cough
• signs of Anemia (low red blood cells; e.g., dizziness,  pale skin, unusual tiredness or weakness, shortness of breath)
• signs of bleeding (such as easy bruising, bleeding gums, nosebleeds, vomiting blood, blood in the urine, dark tarry stools)
• signs of Depression (e.g., poor concentration, changes in weight, changes in sleep, decreased interest in activities, thoughts of suicide)
• signs of infection (Fever, chills, cough, sore throat)
• signs of liver problems (e.g., nausea, vomiting, diarrhea, loss of appetite, weight loss, yellowing of the skin or whites of the eyes, dark urine, pale stools)
• pneumonia (symptoms such as cough that does not go away, or trouble breathing and fever)

Stop taking the medication and seek immediate medical attention if any of the following occur:

• seizures
• signs of an allergic reaction (such as difficulty breathing, Hives, or swelling of the face or throat)
• signs of bleeding in the stomach (e.g., bloody, black, or tarry stools, spitting up of blood, vomiting blood or material that looks like coffee grounds)
• signs of a severe skin reaction such as blistering, peeling, a rash covering a large area of the body, a rash that spreads quickly, or a rash combined with fever or discomfort
• swelling of the hands or feet with shortness of breath
• symptoms of herpes simplex encephalitis (e.g., fever, headache, personality changes, seizures, vomiting)

Some people may experience side effects other than those listed. Check with your doctor if you notice any symptom that worries you while you are taking Temodal (Temozolomide).

Capsules

5 mg
Each size 3 capsule, with opaque green cap and opaque white body, the cap imprinted in black ink with "TEMODAL", the body imprinted in black ink with 2 stripes, "5 mg", and the Schering-Plough logo, contains 5 mg of Temodal (Temozolomide). Nonmedicinal ingredients: colloidal silicon dioxide, lactose anhydrous, sodium starch glycolate, stearic acid and tartaric acid; capsule shells: FD&C Blue No. 2, gelatin, sodium lauryl sulfate, titanium dioxide and yellow iron oxide; ink: shellac, propylene glycol, ammonium hydroxide, black iron oxide, and sometimes potassium hydroxide.

20 mg
Each size 2 capsule, with yellow cap and opaque white body, the cap imprinted in black ink with "TEMODAL", the body imprinted in black ink with 2 stripes, "20 mg", and Schering-Plough logo, contains 20 mg of Temodal (Temozolomide). Nonmedicinal ingredients: colloidal silicon dioxide, lactose anhydrous, sodium starch glycolate, stearic acid and tartaric acid; capsule shells: gelatin, sodium lauryl sulfate, titanium dioxide and yellow iron oxide; ink: shellac, propylene glycol, ammonium hydroxide, black iron oxide, and sometimes potassium hydroxide.

100 mg
Each size 1 capsule, with opaque pink cap and opaque white body, the cap imprinted in black ink with "TEMODAL", the body imprinted in black ink with 2 stripes, "100 mg", and the Schering-Plough logo, contains 100 mg of Temodal (Temozolomide). Nonmedicinal ingredients: colloidal silicon dioxide, lactose anhydrous, sodium starch glycolate, stearic acid and tartaric acid; capsule shells: gelatin, sodium lauryl sulfate, red iron oxide and titanium dioxide; ink: shellac, propylene glycol, ammonium hydroxide, black iron oxide, and sometimes potassium hydroxide.

140 mg
Each size 0 capsules with a blue cap and opaque white body, the cap imprinted in black ink with "TEMODAL'', the body imprinted in black ink with 2 stripes, "140 mg", and the Schering-Plough logo, contains 140 mg of Temodal (Temozolomide). Nonmedicinal ingredients: colloidal silicon dioxide, lactose anhydrous, sodium starch glycolate, stearic acid and tartaric acid; capsule shells: FD&C blue No. 2, gelatin, sodium lauryl sulfate and titanium dioxide; ink: shellac, propylene glycol, ammonium hydroxide, black iron oxide, and sometimes potassium hydroxide.

250 mg
Each size 0 capsule, with opaque white cap and opaque white body, the cap imprinted in black ink with "TEMODAL", the body imprinted in black ink with 2 stripes, "250 mg" and the Schering-Plough logo, contains 250 mg of Temodal (Temozolomide). Nonmedicinal ingredients: colloidal silicon dioxide, lactose anhydrous, sodium starch glycolate, stearic acid and tartaric acid; capsule shells: gelatin, sodium lauryl sulfate and titanium dioxide; ink: shellac, propylene glycol, ammonium hydroxide, black iron oxide, and sometimes potassium hydroxide.

Do not use Temodal (Temozolomide) if you:

• are allergic to Temodal (Temozolomide) or any ingredients of Temodal (Temozolomide)
• are allergic to Dacarbazine (DTIC)
• have severely reduced bone marrow function

There may be an interaction between Temodal (Temozolomide) and any of the following:

• amphotericin B
• bacillus Calmette-Guérin (BCG vaccine)
• Clozapine
• Deferiprone
• Denosumab
• dipyrone
• echinacea
• Fingolimod
• Leflunomide
• Natalizumab
• Nivolumab
• other medications to treat cancer (e.g., Carboplatin, Cyclophosphamide, Doxorubicin, Ifosfamide, Vincristine)
• Pimecrolimus
• Roflumilast
• Tacrolimus
• Trastuzumab
• vaccines
• Valproic acid

If you are taking any of these medications, speak with your doctor or pharmacist. Depending on your specific circumstances, your doctor may want you to:

• stop taking one of the medications,
• change one of the medications to another,
• change how you are taking one or both of the medications, or
• leave everything as is.

An interaction between two medications does not always mean that you must stop taking one of them. Speak to your doctor about how any drug interactions are being managed or should be managed.

Medications other than those listed above may interact with Temodal (Temozolomide). Tell your doctor or prescriber about all prescription, over-the-counter (non-prescription), and herbal medications you are taking. Also tell them about any supplements you take. Since caffeine, alcohol, the Nicotine from cigarettes, or street drugs can affect the action of many medications, you should let your prescriber know if you use them.

Before you begin using a medication, be sure to inform your doctor of any medical conditions or Allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use Temodal (Temozolomide).

Birth defects: Temodal (Temozolomide) can have genotoxic effects, meaning that it may damage the genetic material contained in sperm. This could lead to birth defects. If you are a man being treated with Temodal (Temozolomide), you should not father a child during treatment and for up to 6 months after treatment.

Blood disorders: Temodal (Temozolomide) can cause the levels of certain blood cells to drop. This may lead to problems with blood clotting, the immune system, or the transport of oxygen through the body. Contact your doctor immediately if you develop a fever, chills, easy bruising, paleness, or bleeding (symptoms may include black and tarry stools, blood in the urine, or cuts that won't stop bleeding) while taking Temodal (Temozolomide). Your doctor will arrange periodic blood testing to monitor various blood components.

Hepatitis B infection: Temodal (Temozolomide) has been linked to reactivation of Hepatitis B infection. If you have had hepatitis B in the past discuss with your doctor how Temodal (Temozolomide) may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Temodal (Temozolomide), and whether any special monitoring is needed.

Kidney function: The safety and effectiveness of using Temodal (Temozolomide) have not been established for people with kidney problems. You should be closely monitored by your doctor if you have kidney problems.

Liver function: Temodal (Temozolomide) may reduce liver function and can cause liver failure, including death. If you have liver problems, discuss with your doctor how Temodal (Temozolomide) may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Temodal (Temozolomide), and whether any special monitoring is needed. Your doctor may want to test your liver function regularly with blood tests while you are taking Temodal (Temozolomide).

If you experience symptoms of liver problems such as fatigue, feeling unwell, loss of appetite, nausea, yellowing of the skin or whites of the eyes, dark urine, pale stools, abdominal pain, or swelling, and itchy skin, contact your doctor immediately.

Male infertility: Irreversible infertility may result from treatment with Temodal (Temozolomide). Therefore, men who may want to father a child in the future should seek advice on cryoconservation (freezing for long-term storage) of sperm prior to starting treatment.

Pneumocystis carinii pneumonia (PCP): People who take Temodal (Temozolomide) daily along with radiation may be at a higher risk of developing a serious form of pneumonia called Pneumocystis carinii pneumonia (PCP). If you are taking Temodal (Temozolomide) daily along with radiation, your doctor will prescribe medication to help prevent PCP.

Vomiting: Nausea and vomiting are very common with Temodal (Temozolomide) treatment. Antinausea medications taken before or after taking Temodal (Temozolomide) may be recommended.

Pregnancy: Temodal (Temozolomide) may harm the baby if used during pregnancy. Women should avoid becoming pregnant while taking Temodal (Temozolomide). Use effective birth control while using Temodal (Temozolomide) and for 6 months after stopping the medication. Tell your doctor immediately if you become pregnant.

Breast-feeding: It is not known if Temodal (Temozolomide) passes into breast milk. It is recommended that women should stop breast-feeding while taking Temodal (Temozolomide).

Children: The safety and effectiveness of using Temodal (Temozolomide) have not been established for children.

Seniors: People over the age of 70 are more likely to experience a decrease in white blood cell counts or platelet cells. This can affect their body's ability to fight infection or their blood's ability to clot.