Medical Definition of metastatic. 1  1: of, relating to, or caused by metastasis cutaneous metastatic disease as the first sign of lung cancer metastatic carcinoma metastatic spread. 2  2: tending to metastasize metastatic cancer cells metastatic prostate cancer.
Acetylcholinesterase inhibitor (generally referred to as cholinesterase inhibitor): a chemical that binds to the enzyme, cholinesterase, and prevents it from breaking down the neurotransmitter, acetylcholine.
These effects are seen when antipsychotic drugs are taken for a period of 6-12 weeks. The benefits of these drugs for other symptoms and when used for longer than 12 weeks are very limited. Antipsychotic drugs may be prescribed for people with Alzheimer's disease, vascular dementia or mixed dementia.he other anti-dementia drugs-donepezil, rivastigmine and galantamine-are known as cholinesterase inhibitors. Cholinesterase inhibitors, particularly rivastigmine and donepezil, may reduce the severity of some behavioural and psychological symptoms in dementia and help delay their onset.