Painkillers are analgesic medications. Pain is experienced when the special nerve endings in that part of the injured body send pain messages to the brain. Painkilling medicines interfere with these messages either at the site of the injury, in the spinal cord or in the brain and block the pain. Painkillers are available in different forms. They can be swallowed as tablets, capsules or liquids. There are painkillers in the form of injection, suppositories, creams or an ointment.
Painkiller abuse is on the rise all over the world and the US is possibly the largest consumer of Painkillers. One of the reasons is the easy availability of OTC Painkillers and possibly owing to the drug induced exuberance or 'high' associated with the intake of some kind of narcotic painkillers. The following pages offer a complete insight about the different types of Painkillers and their effects.
Pain killer medications are broadly classified into two main groups:
|Narcotic Painkillers||Non-narcotic painkillers|
|1. Act centrally to relieve pain||1. Act peripherally to ease pain|
|2. Can cause addiction/dependence||2. Do not cause addiction|
|3. Form part of schedule II/III controlled drugs||3. Not part of controlled drugs|
|4. Absence of gastric irritation||4. Possibility of gastric irritation|
|5. Possibility of sedation, respiratory depression.||5. Possibility of bleeding problems.|
|6. No anti-inflammatory effect||6. Has anti-inflammatory effect.|
Common Non-narcotic painkillers: Non narcotic painkillers include two types, namely Non steroidal anti inflammatory drugs (NSAIDs) and Acetaminophen.
Aspirin - Actual drug name : Acetylsalicylic Acid is one of the widest known/used drugs to manage pain and to some extent fevers. With its anti-coagulant properties Aspirin is used for lowering the risk of heart attack and strokes in low doses.
Dosage: For Pain management in Adults: 3 gm per day in divided doses.
Lowering of the risk of heart attack and strokes (Myocardial Infarction - Prophylaxis or Thromboembolic Stroke Prophylaxis): - Single dose between 75 and 325 mg.
Ibuprofen : Another potent Analgesic in the NSAID group, Ibuprofen is useful to treat mild to moderate pain and helps to relieve symptoms of arthritis (osteoarthritis, rheumatoid arthritis or juvenile arthritis), such as inflammation, swelling, stiffness, and joint pain. It is also used as an Antipyretic and for symptomatic treatment of menstrual cramps.
Dosage: For Pain management in Adults: 200 - 400 mg every 4 hours in a day if administered orally. 400 - 800 mg if administered intravenously over a period of 30 minutes every 6 hours.
Naproxen : This NSAID is effective to control pain, stiffness and inflammation associated with conditions like arthritis, ankylosing spondylitis, Tendonitis, bursitis and gout.
Dosage: For Pain management in Adults: 500 mg Naproxen twice daily or in divided doses subject to a maximum of 1 gm per day.
Diclofenac : This NSAID is useful for pain management when there is inflammation such as Arthritis, Dermatomyositis and Ankylosing Spondylitis.
Dosage: For Pain management in Adults: 50mg tablets 3 times a day subject to a maximum of 150mg per day.
Indomethacin : This drug is prescribed for fever, pain, stiffness and swelling especially for relieving symptoms of swelling and pain related to osteoarthritis, rheumatoid arthritis and ankylosing spondylitis. Indomethacin is effective also to treat acute shoulder pain and gouty arthritis.
Dosage: For Pain management in Adults: 25 - 50 mg every 8 hours subject to a maximum of 150 - 200 mg per day depending upon the severity of the pain.
Celecoxib: is used for rheumatoid arthritis, osteoarthritis, ankylosing spondylitis, juvenile arthritis and menstrual pain.
Dosage:For Pain management in Adults: 200 mg once per day.
NSAIDs provide relief from pain associated with inflammation. They are commonly used for headaches, fever, dental pain, dysmenorrhea, bone pain, arthritis and muscle aches. If prescribed alone, NSAID relieves slight to moderate pain and for moderate to severe pain relief, NSAIDs are used in combination with opioids. Some NSAID can be purchased over-the-counter and does not require a prescription from a medical doctor. Do not use this class of drug immediately before or after Coronary Artery Bypass Graft (CABG). Generally NSAIDs are not advisable when Dengue fever is present as this class of analgesics may induce capillary leakage which can lead to hemoconcentration and serous effusions resulting in circulatory collapse.
Acetaminophen: is available under many trade names. e.g.; Tylenol, Panadol
Being an Analgesic and an Antipyretic (drug to reduce fever), Paracetamol (Acetaminophen) is used to treat many conditions such as headaches, muscles aches, arthritis, backache, toothaches, colds and fever caused by infection. Acetaminophen is available in the form of chewable tablets, capsules, liquid as well as in the form of suppositories. Acetaminophen can be taken after or before food unless specifically directed by the doctor.
Contraindication: Certain prescription medications when taken along with Paracetamol can cause problems. Paracetamol is not to be used without recommendation from a doctor under any of these circumstances.
Paracetamol during pregnancy
Paracetamol is not to be used by pregnant women without recommendation from the doctor. Taking Paracetamol while breast feeding can harm a nursing baby as Paracetamol can pass into breast milk. Signs of allergic reaction to Paracetamol include hives, difficulty breathing, and swelling of the face, lips, tongue or throat. Without further delay seek medical help.
Dosage: For Adults: 500 mg tablets every four hours per day subject to a maximum of 4 gms.
Narcotic painkillers: When the OTC painkillers do not provide the much needed relief from pain, narcotic painkillers are prescribed by the doctor. Narcotic are powerful painkillers effective in relieving severe pain. If not taken correctly or as directed by the doctor, narcotic painkillers can have serious side effects.
Codeine is used to treat mild to moderately severe pain. It is also used to reduce severe cough and diarrhea. Codeine is available in the form of a tablet, a capsule, and a solution (liquid). Codeine can be taken with or without food. Narcotic medications should never be combined with alcohol as it can lead to dangerous side effects or even death. If there is a history of hypersensitivity to Codeine, it should not be prescribed. Also, Codeine is not to be used under these circumstance:
Codeine during pregnancy
FDA has categorized Codeine in Category C. Pregnant women or women planning to conceive should inform the doctor before using Codeine. If potential benefits outweigh potential risks, Codeine may be recommended for use during pregnancy. Codeine can pass into breast milk and may harm a nursing baby. Mild side effects include dizziness, lightheadedness, headache, drowsiness, mood change, nausea, vomiting, constipation, stomach pain and difficulty urinating. Serious side effects include difficulty in breathing, palpitations, hives, change in vision and seizures.
Fentanyl is prescribed to treat pain in cancer patients. Fentanyl is particularly used for 'breakthrough pain', pain that is not controlled by other medicines. Fentanyl is usually not prescribed for treating or relieving pain other than cancer related. Fentanil is available in the form of buccal tablet, buccal film, nasal spray, oral transmucosal lozenge, transdermal film extended release. Fentanyl is not for casual use as this drug is far more potent than Morphine. Do not use this medication to relieve mild, short-term, or sudden pain.
Fentanyl is contraindicated for select health conditions and circumstances. Those with a known history of substance abuse should keep away from Fentanyl. If MAOI has been taken within 14 days, Fentanyl should be avoided as it may cause seizures, hyperthermia, and hypertension and in serious cases loss of life.
Fentanyl during pregnancy
FDA has categorized Fentanyl in Category C. Pregnant women or women planning to conceive should inform the doctor before using Fentanyl. There is a possibility of addiction or withdrawal symptoms in newborns if the pregnant mother takes Fentanyl during pregnancy.
Meperidine (or Pethidine as it is commonly known)is prescribed to ease moderate to severe pain as determined by the doctor. In particular, Meperidine is used to ease pain that is experienced before or during surgery, for pain during labor and delivery. In some cases, Meperidine is prescribed for pain occurring from chronic conditions like sickle cell anemia and some type of cancers. Meperidine is available in the form of tablets as well as oral solution. Meperidine can be taken with or without food or as directed by doctor.
Pethidine is contraindicated in patients who are hypersensitive to Pethidine and those who have received recently. Also, patients who have breathing problems, respiratory depression, paralytic ileus, severe infectious diarrhea should avoid Meperidine. Do not take Meperidine while taking medicines like ritonavir, sibutramine or sodium oxybate.
Meperidine during pregnancy: FDA has categorized Meperidine in Category C. As there is a high possibility of respiratory depression in newborns, Meperidine should not be used in pregnant woman.
Side effects may be mild or severe. Less serious effects of Meperidine include constipation, loss of appetite, headache, feeling weak, dry mouth, excessive sweating, and unusual itching, below normal urinating, loss of interest in sex.
Morphine is used for severe pain, cough suppression and sometimes before surgery. In most cases, Morphine is prescribed when the patient requires relief from pain for longer than a few days. Morphine is available in the form of capsules, oral solution, syrup or tablets. It is advantageous to drink plenty of liquid while taking Morphine.
Morphine is contraindicated in patients who have undergone surgery unless Morphine was used before surgery.
Morphine during pregnancy
FDA has categorized Morphine as Category C. Pregnant women or women planning to conceive should inform doctor before using Morphine. There is a possibility of addiction or withdrawal symptoms in newborn if the pregnant mother takes Morphine during pregnancy. Morphine can pass into breast milk and may harm a nursing baby.
Morphine side effects
There can be mild and severe side effects of Morphine. Look out for these side effects and remember to discuss with the doctor without delay. Besides these in case of any unusual body response, seek medical attention without delay.
Similar to Morphine, Oxycodone is used for severe pain, cough suppression and sometimes before surgery. In most cases, Oxycodone is prescribed when the patient requires relief from pain for longer than a few days. Oxycodone is available in the form of a pill and liquid form. Drink plenty of water to avoid constipation. Oxycodone like many other Narcotic Pain Killers can be dangerous if alcohol is consumed. It is contraindicated for Asthma patients or those who suffer from paralytic ileus.
Oxycodone during pregnancy The FDA has assigned category B for Oxycodone. Unless the potential benefits outweigh the risks, Oxycodone is not given to pregnant women as this narcotic drug is habit forming. Though Oxycodone is excreted into breast milk, the potential effects are not well-established.
Tramadol is prescribed to relieve pain and is recommended for short term use only. Tramadol is effective in managing pain for rheumatoid arthritis, fibromyalgia and restless legs syndrome. Tramadol is available in the form of tablets, capsules, liquid and injection form.
Contraindication: Tramadol is contraindicated in patients who are suffering from epilepsy, previous head injury as it can induce seizures. Tramadol should not be prescribed to those with allergic reaction to any narcotic drug. Tramadol should not be taken with other medications like muscle relaxants, anti nausea medicines and anti depressants as it can exacerbate other underlying conditions.
Tramadol during pregnancy
The FDA has categorized Tramadol under category C. There are significant chances of the unborn baby developing problems and hence pregnant woman should not use Tramadol. Further, as Tramadol can pass into breast milk and harm a nursing baby, it should not be used while breast feeding.
Tramadol side effects
Most common side effects of Tramadol are constipation, diarrhea, drowsiness, dry mouth or nausea. If these persist seek medical attention immediately. Some of the serious side effects of Tramadol include severe or mild headaches, difficulty with swallowing, sudden mood swings, seizures, blurred vision, ringing in the ears and colored stools. Contact your doctor or go to the nearest emergency hospital.
Hydrocodone - a narcotic analgesic is usually available in combination with other ingredients like Paracetamol which contributes to better effect in pain control. There are Hydrocodone combinations to relieve moderate to severe pain and some to relieve cough. Hydrocodone is available in the form of tablet, capsule, syrup, solution and extended-release capsule as well as extended-release suspension. A normal diet would suffice unless specifically directed by doctor while using Hydrocodone.
Hydrocodone is contraindicated in patients with hypersensitivity to Hydrocodone or any ingredient of the formulation. Those with CNS (Central nervous system) depression and severe respiratory depression should avoid hydrocodone.
Hydrocodone during pregnancy
Hydrocodone is categorized under C by the FDA. As there is certain amount of risk associated, Hydrocodone is prescribed for pregnant women only if the potential benefits outweigh potential risks. Some of the side effects include nausea, headache, chest constriction, irregular heartbeat, allergic reactions and trouble urinating.
Hydromorphone is used to treat longer bouts of pain that do not respond to OTC painkillers. Being stronger than Morphine, hydromorphone is preferred to regulate pain from injuries, surgery, cancer and severe migraine headaches. Hydromorphone is normally given through parenteral administration as other ways of administrations result in poor absorption.
Hydromorphone is contraindicated in these circumstances.
Hydromorphone during pregnancy
As per FDA classification, Hydromorphone falls under category C. Unless, the potential benefits outweigh potential risks, doctors will not prescribe hydromorphone for pregnant women. Nausea and vomiting are very common side effects that occur initially. Serious side effects of Hydromorphone include allergic reaction, hives, confusion, severe weakness, losing consciousness and seizures. Seek medical attention immediately without any delay.
FDA Pregnancy Categories Drugs are divided into many categories based on the given drug and its effects on the fetus or its mother during pregnancy:
AFP Test or Alpha-fetoprotein test is conducted on pregnant women to check the AFP level in the blood. The liver in the fetus produces AFP naturally. Determining the amount of AFP in the mother's blood will help identify any neural tube defect in the fetus. Neural tube defects arise in 2 out of every 1,000 pregnancies. AFP test also helps check for Down's syndrome. There are 60% chances for detecting Down's syndrome when the AFP levels are low in the blood. AFP can also be calculated from the sample of amniotic fluid of a pregnant woman. This screening test is generally performed between 16 and 18 weeks of pregnancy and is very sensitive between 15 and 17 weeks. The accuracy of the AFP test result lies in the exact age of the fetus. The AFT test is also referred to as maternal serum alpha-fetoprotein (MSAFP). AFP test is done on men and non-pregnant women too to confirm cancer in the testicles, stomach, pancreas, liver and the ovaries. High levels of AFP can indicate renal cell cancer.
Interpretation of AFP test results: In men and non-pregnant women, the values of the AFP test is 0-6.4 IU/mL (international units per milliliter), 0-20 nanograms per milliliter (ng/mL) or 0-20 micrograms per liter. In pregnant women of about 15 - 22 weeks gestation, the AFP results usually show 19-75 IU/mL, 7-124 ng/mL or 7-124 microgram per liter. AFP test values vary depending on the weight of the woman and race. Black women have higher values than white women and white women have higher values than Asian women. High AFP can suggest multiple pregnancies, fetus with neural tube defects, and abdominal wall defect in the fetus or fetal death. In non-pregnant adults, high AFP values mean cancer in the testicles or ovaries. High AFP can also indicate liver disease and bowel inflammation.
Often pregnant mothers are warned to keep away from cats for fear of Toxoplasmosis, which spreads to human through cat feces. This can lead to severe health issues for the unborn baby. As a cat ingests an infected small animal such as a rodent, the protozoa invade cells of the cat's intestine. The parasite undergoes several developmental changes to become infective and gets released into the environment in cat feces. This parasite can invade another animal or human, as it buries into skeletal muscles, heart muscles and the brain. It forms cysts, and can stay there throughout her entire life. It is quite rare for humans to get Toxoplasmosis as house cats are not allowed outside and do not carry this parasite; wild cats or those that live outside and hunt are most likely to host toxoplasmosis parasite.
How does Toxoplasmosis spread ?
Toxoplasmosis can spread through:
Food, especially uncooked meats, pork, lamb which may carry toxo cysts.
Though the parasite is not infectious until 1 to 5 days after being excreted by an infected cat, it can survive in the environment or litter box for over a year.
Symptoms of Toxoplasmosis
Most infected with the parasite toxoplasmosis show no signs or symptoms. Approximately 10 to 20% of patients will develop flu-like symptoms that can last several weeks or more. Some develop swollen glands, such as in the neck - cervical lymph nodes. Confusion, lack of coordination, seizures, trouble breathing and blurred vision are some other signs of toxoplasmosis. These symptoms can last for a month or more and resolve on their own. Those with weakened immune system are at a risk of developing:
An infected fetus may exhibit symptoms mild or quite serious. It can lead to miscarriage, stillbirth or birth abnormalities including enlargement or smallness of head. Toxoplasmosis in an unborn baby can be life threatening for the baby soon after birth. It can also infect the baby's eyes and lead to temporary or permanent loss. While most newborns with congenital toxoplasmosis appear normal at birth, it can develop signs and symptoms as they age. Hence, it is important to check the baby's brain and eyes.
The parasite causing Toxoplasmosis is Toxoplasma gondii (T.gondii), which survives in contaminated meat that is raw or not thoroughly cooked. Drinking contaminated water, or in some rare cases, blood transfusion or a transplanted organ can cause toxoplasmosis. The parasite exists in feces and mostly found in feces of cat. This means, it can be found in some unwashed produce contaminated with manure. Wash your produce thoroughly to prevent toxoplasmosis.
The Role of Toxoplasma gondii in behavioral change: Even when the immune system combined with anthelmintic drugs fight off the parasites, they can remain dormant in the brain in some cases. According to an evolutionary biologist Jaroslav Flegr, these dormant parasites can affect the neuron connectivity in the brain resulting in strange behaviors which include increased suicidal tendencies. Another effect is lowered reaction time, increase in irritation which combine to increase the rate of road accidents. Rats infected with the parasite exhibit poor self preservation as they appear fearless against their predator - cats, an effect dubbed as fatal feline attraction. It affects men in a negative way while having no similar effects in women. Further research is needed to know the exact mechanism of how the parasite affects the brain cells.
In the US, although the parasite is found in nearly all warm-blooded animals, cats are the only hosts. The parasite's eggs only reproduce sexually in cats. And interestingly, cats do not show any symptoms of Toxoplasmosis, though they are hosts. Those humans who ingest the parasite become infected with toxoplasmosis. This happens, most likely, when cleaning out a litter box without washing hands properly afterward. Pregnant woman are at an increased risk of passing toxoplasmosis to their unborn child and hence, it is important to ask someone else to take care of cat litter box during pregnancy. Protect hands with gloves and change cat litter box daily. And remember, the parasite is not infectious until one to five days, after it is shed.
Toxoplasmosis, though can infect anybody, is more severe in people whose immune systems are weakened, such as those with HIV. The infection can particularly be worrisome in pregnant woman.
To diagnose Toxoplasmosis clinically could be difficult. A swollen lymph node may be the key to diagnosis, and diagnosis can be made if blood sample is sent specifically for toxoplasmosis. The blood test looks for antibodies against Toxoplasmosis and this specific antibody can help clinicians estimate when the infection occurred. Other diagnosis, though less common, includes microscopic examination of tissues or body fluids for presence of this parasite. Toxoplasma DNA in amniotic fluid is used to determine if the fetus is infected.
Most healthy people recover without any treatment. Pregnant women and infants are usually treated with drugs – a combination of pyrimethamine (Daraprim) and sulfadiazine. Pyrimethamine is also used to treat malaria. Sulfadiazine is an antibiotic. Alternate regimens are available for those with drug allergies. If the disease is persistent, and it involves the eyes or internal organs, or the patient is suffering from HIV or AIDS, they need to continue these medications for life.
Treatment for pregnant mothers
During pregnancy, the treatment is somewhat different. The course of treatment depends upon whether the unborn child is infected and if so, the severity of the infection. Most likely, an antibiotic is prescribed depending upon how far she is in pregnancy and to reduce the likelihood of transmission to the fetus. A combination of drugs is generally used during second or third trimesters. If her unborn baby has toxoplasmosis, then pyrimethamine and sulfadiazine may be considered as a treatment. However, these drugs do have significant side effects on the mother and fetus and are used only as a last resort. Potential side effects include bone marrow that helps produce blood cells and liver toxicity.
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Bibliography / Reference
Collection of Pages - Last revised Date: December 1, 2022