"effective medication" is correct and usable in written English.
It can be used to describe a medication which produces the desired results. For example, "After taking the effective medication, the patient's symptoms were significantly reduced."
Knowing the interaction between antiepileptics and contraceptives is important to find the most effective medication with fewer side effects.
Naloxone is a safe, effective medication that blocks the effects of opiates to the brain and reverses the respiratory failure caused by overdose.
Recognizing that no effective medication exists is just as important as knowing which one to select.
In some cases, this made it impossible for them later to find effective medication.
It can take four or five tries to calibrate the most effective medication, said Dr. Unützer.
In 1998, the Annals of Allergy, Asthma and Immunology published treatment guidelines stating that these nasal sprays "are the most effective medication class for controlling symptoms" of allergies.
Not so in the developing world, where most people with AIDS will die long before any effective medication comes within reach.
Besides, he had not had a seizure in a year, since he found effective medication, and did not want to take another humiliating trip back to square one.
The agency helped him look for effective medication and enrolled him in a workshop to learn basic job skills, like working in a factory.
Treatment can help, including psychodynamic and cognitive therapy, but there is still no effective medication for masochism.
There is no effective medication against Ebola, but their symptoms of fever, vomiting and diarrhoea were treated and they were kept hydrated and given regular meals.
