What is BD OD and HS?
Asked by: Sam Schaden | Last update: May 10, 2026Score: 4.1/5 (31 votes)
In medical prescriptions, BD means twice a day (bis in die), OD means once a day (omni die), and HS means at bedtime (hora somni), indicating the frequency and timing for taking medications.
What does HS mean on a prescription?
HS: At bedtime (Latin: hora somni). Indicates medicine should be taken before sleep at bedtime, ensuring effectiveness overnight or minimizing drowsy or sleep-related side effects.
What is OD or BD?
In medical prescriptions, OD (omne in die) means once daily, while BD (bis in die) means twice daily, both Latin abbreviations indicating how often a medication should be taken for effective treatment. These abbreviations help doctors specify dosing schedules, with OD requiring one dose per day and BD requiring two doses, ideally 12 hours apart.
What does BD mean on a prescription?
BD – twice a day – usually talking about a frequency of medication. TDS – three times a day – usually regarding medication frequency.
What does Q HS mean on a prescription?
On a prescription, QHS is a Latin abbreviation for quaque hora somni, meaning "every night at bedtime" or "at bedtime," instructing you to take the medication once daily before sleep for optimal effectiveness, especially for drugs that work with the body's rhythms or cause drowsiness.
Medical abbreviation | simple and easy
What does HS mean in pills?
h.s. - can mean half strength or "hour of sleep"
What are OD, BD, and SOS in medical terms?
Abbreviations: po = orally; stat = in one dose; bd = twice daily; IM = intramuscular; tds = three times daily; od = once daily.
What does OD mean on a prescription?
Medicine. OD or o.d., an abbreviation used in medical prescriptions for omne in die or "once daily" both meaning "take once every day" Doctor of Optometry (O.D.) Oculus dexter, ocular dexter, or ocularis dexter, meaning "right eye" in general ophthalmologic or optometric usage, particularly in eyeglass prescriptions.
Why do doctors write BD?
BD Full Form in Medical
The BD full form originates from the Latin phrase “bis in die,” which translates to “twice a day” in English. Doctors use this abbreviation to tell patients how often to take medication or receive treatment. This helps ensure patients get the right care.
What is the difference between qhs and hs?
qhs: Latin shorthand for “every night at bedtime.” hs: Abbreviation often used to mean “at bedtime.” Pharmacokinetics (how the body absorbs and clears a drug): The study of what the body does to a medicine.
What is BD in medical diagnosis?
In medical diagnosis, "BD" most commonly refers to Bipolar Disorder, a mental health condition causing extreme mood swings. However, depending on the context, it can also stand for Behçet's Disease, a rare inflammatory disorder of blood vessels. Less commonly, in prescribing, bd (lowercase) means bis in die, or twice a day, for medication frequency, and in lab settings, it can refer to Becton Dickinson (BD) diagnostics.
What does OD mean in RX?
OS and OD meaning
OD is short for the Latin term oculus dexter which means right eye. OS is an abbreviation of the Latin oculus sinister which means left eye. You'll often see this terms on eyeglass prescriptions.
What does it mean to take medication twice a day?
Take twice daily typically means to take a medication approximately 12 hours apart each day. There are many different reasons for needing to take a medication multiple times per day instead of just once.
What is OD and HS mean?
h.s., hs: This abbreviation which means "before bedtime" can be mistaken for HS which means "half strength" and vice versa. o.d.: While o.d. can mean "once daily," it can be confused for OD which means right eye.
What does hs stand for?
"HS" has several meanings, most commonly High School (secondary education) or, in medicine, hora somni (at bedtime); it also stands for the Harmonized System in international trade, the element Hassium, and the chronic skin condition Hidradenitis Suppurativa. The context usually clarifies the intended meaning, from school grades to medical orders or trade codes.
What is the HS code in medicine?
The Harmonized Commodity Description and Coding System, also known as the Harmonized System (HS) of tariff nomenclature is an internationally standardized system of names and numbers to classify traded products.
What is BD medical?
In medical terms, BD usually means "twice a day" or "every 12 hours," from the Latin bis in die, and is used on prescriptions to indicate medication frequency, though sometimes it can refer to specific brands or Bipolar Disorder. More commonly, you'll see BID (also twice daily), TDS (three times daily), or OD (once daily) for dosage instructions, with modern prescriptions often favoring clearer English to avoid confusion.
What is HS in medical prescription?
Medical Abbreviations That Indicate When To Take Your Medication: AC, from the Latin 1 “ante cibum,” means “take before a meal.” HS, from the Latin “hora somni,” means “take at bedtime.” PC, from the Latin “post cibum,” means “take after a meal.”
What does OD mean?
"OD" has several meanings, most commonly overdose (drugs/alcohol), slang for over the top/extreme, medical/prescription abbreviations for once daily (omne in die) or right eye (oculus dexter), or an academic title like Doctor of Optometry. Context determines the meaning, from emergency situations to casual conversation to formal documentation.
What is an OD vs an MD?
"OD vs MD" usually refers to the difference between an Optometrist (O.D.) and an M.D. (Medical Doctor) in eye care, or a Doctor of Medicine (M.D.) versus a Doctor of Osteopathic Medicine (D.O.) in general medicine, with the main distinction being approach: M.D.s focus on disease-specific treatment, while D.O.s emphasize a holistic, body-mind-spirit connection, including hands-on manipulative techniques (OMM). Both M.D.s and D.O.s are fully licensed physicians who can prescribe medicine, perform surgery, and specialize in any field, but O.D.s (Optometrists) are primary eye care providers who examine, diagnose, and manage vision problems but generally don't perform surgery like M.D. Ophthalmologists.
Can an OD perform surgery?
Yes, Doctors of Osteopathic Medicine (DOs) are fully licensed physicians who can perform surgery, prescribe medicine, and practice in any medical specialty, including surgery, just like Medical Doctors (MDs). DOs complete similar training and residencies, allowing them to specialize in fields like general surgery, cardiovascular surgery, or neurosurgery, often with an added focus on the body's musculoskeletal system.
What does OD BD and TDS mean?
In medical prescriptions, TDS means three times a day, BD means twice a day, and OD means once a day, all derived from Latin to guide medication timing for clear dosing instructions. These abbreviations ensure patients take medications at the correct frequency (e.g., every 8 hours for TDS, every 12 hours for BD, once daily for OD) for effective treatment, simplifying communication between healthcare providers.
What does 3/7 mean in drug prescription?
Number of days = number of days/7 (e.g. 3/7 = 3 days) Number of weeks = number of weeks/52 (e.g. 4/52 = 4 weeks)
What is BD and TD?
BD: Twice a Day. You must take medicine two times a day at the same time. ● TDS: Three Times a Day. You must take medicine three times a day at regular intervals.
What are common medical uses of BD?
- BD Hypodermic Needle and Syringe Solutions.
- Integrated Diagnostic Solutions.
- Medication Management Solutions.
- Patient Safety Solutions.
- Pharmaceutical Microbiology.
- Sepsis Management.