Direct acting antiviral

Direct acting antiviral – See DAA.

DAA (direct acting antiviral)

DAA (direct acting antiviral) – new hepatitis C drugs that work directly against the hepatitis C virus (HCV). Since 2014, the following DAAs and fixed dose combinations have been approved – and more are in development. Links are to the EMA website for information …


diarrhoea – when stools (faeces) is less than firm. This can range from loose to being very watery. As a medical condition it is usually also associated with needing to go to the toilet more frequently. For example, this is commonly …


DEXA – a non-invasive scan that can measure the percentage of different body areas (whole body, trunk, right leg etc) that are muscle or fat. DEXA scans cannot determine if this is central fat (visceral adipose tissue, VAT) or sub-cutaneous …


diabetes – when the body either does not produce enough insulin (a hormone that helps the body turn sugar into energy) or is not responding to insulin (insulin resistance). There are two types of diabetes and they have different mechanisms …


dronabinol – medicine made from the active ingredient in marijuana. Dronabinol is approved in the US but is no longer available in the UK.

drug resistant mutation

drug resistant mutation – a mutation or change that occurs in the HIV genome that reduces a drugs ability to work.


DNA – an abbreviation for the scientific word for genes and genetic material. It is the abbreviation for deoxyribonucleic acid. See RNA.


dyspnoea – medical term for symptoms related to difficulty breathing, shortness or breath.


dyspepsia – a range of symptoms related to digestion problems that can include pain, nausea, heart burn. vomiting and pain in the stomach or upper intestine.

Duration of ruptured membranes

duration of ruptured membranes – time between when the mother’s waters break and the actual delivery.


duration – how long in time.

Dual therapy

dual therapy – using 2 drugs together.

Drug resistant (HIV)

drug resistant (HIV) – HIV that is harder to treat because of genetic changes.


DOT (directly observed therapy) – where a nurse or other healthcare worker observes or supervises someone take medicine.


diagnosis – identifying the cause of an illness.

Decimal fraction

decimal fraction – a fraction turned into a number by dividing the top part by the bottom part. For example, the decimal fraction for 3/5 is 0.6.