Hi, Thanks for asking. All the drugs which are mentioned, belong to NSAID group of drugs ( Non Steroidal Anti Inflammatory Drugs) and are prescribed for Pain relief. A person may develop allergy not only to the abovesaid drugs but to ANY of the drugs. And if someone is allergic to a drug, say drug X he/she would develop some allergic symptoms. Depending upon the body s immune response, one may develop SEVERE ALLERGIC REACTION IMMEDIATELY (Anaphylaxis, a life threatening type of allergic reaction which is rapid in onset and the person might develop itchy rash, throat swelling, and low blood pressure which will eventually lead to death) OR MILDER ALLERGIC REACTION causing only some itchy rashes which subsides soon after stopping the drug. You have not mentioned what kind of allergic manifestations your friend experienced while the said drugs were given. Whatever may be the type of manifestation, had he/she experienced any of the above said symptoms, he/she MUST NEVER take those medication for the fear of exageratted immune response which may be life threatening and he must tell the health care provider regarding the medicine to which he/she is allergic to. The above said drugs if taken without proper medical supervision, are known to affect the stomach mucosa, causing Peptic ulcer and in chronic,repeated, unsupervised consumption and sometimes overdose they are known to damage the function of the Kidneys. so better AVOID self medicating these NSAID s. They may aggravate the heart failure in those who are already suffering from Heart failure but themselves do not cause heart failure. take care, regards, Dr.K.Muthukumar MD