Generic Neurontin is used for treating seizures associated with epilepsy. It may also be used for treating nerve pain associated with herpes zoster (shingles) infection (postherpetic neuralgia).
Generic Principen is an antibiotic in the penicillin group of drugs. It is used to treat many different types of infections caused by bacteria, such as ear infections, bladder infections, pneumonia, gonorrhea, and E. coli or salmonella infection.