Disorders of Menstruation Lecture Notes
Disorders of Menstruation
Concepts apply to trans people who menstruate.
Review of the Menstrual Cycle
Part 1
Controls female reproductive physiology.
Cycle length is variable (21-40 days, average 28 days).
Women menstruate ~360-400 times from menarche to menopause.
Every cycle ~30-90 mL blood is shed.
Phases:
Follicular (Proliferative) Phase
Ovulatory Phase
Luteal (Secretory) Phase
Menarche:
Start
Any age: 10-14 years old, average 12
Based on genetics and environment
Hypothalamic-Pituitary-Ovarian (HPO) Axis
Dynamic relation between hypothalamus, anterior pituitary, and ovary.
The rate and amplitude of GnRH pulses from the hypothalamus determine which hormone is released by the pituitary.
Hypothalamus releases GnRH.
Anterior pituitary produces LH, FSH
Ovary produces estradiol, inhibin, and progesterone.
Negative feedback loops: estradiol, inhibin, and progesterone inhibit hypothalamus and anterior pituitary.
Day 1: menses start.
Day 7: one follicle releases a dominate to grow.
Follicle and estrogen are stimulating LH hormone
Day 13: LH surge, releasing of mature egg from ruptured follicle.
Day 14: ovulation.
Day 21: corpus luteum grows until 21 days and makes progesterone.
Corpus luteum dies at day 28.
Low levels of estrogen and progesterone
The Menstrual Cycle - Progesterone drop
As the progesterone level drops:
the corpus luteum begins to degenerate;
the endometrium begins to break down, its cells committing apoptosis;
the inhibition of uterine contraction is lifted, and
the bleeding and cramps of menstruation begin.
The Menstrual Cycle - Study
2019 study (n= 612, 613)
Mean follicular phase length: 16.9 days
Mean luteal phase length: 12.4 days
Mean cycle length decreased by 0.18 days and mean follicular phase length decreased by 0.19 days per year of age from 25 to 45 years
Mean variation of cycle length per woman was 0.4 days or 14% higher in women with a BMI of over 35 relative to women with a BMI of 18.5–25
Between women, the follicular phase can range in length from days to weeks.
Thus, how long the follicular phase is for a particular individual determines menstrual cycle length.
Corpus luteum only viable for 14 days unless pregnancy occurs.
Egg is only viable for 24 hours after being released from follicle.
Variation:
Health and genetics
Dysmenorrhea
Part 2
True or False Questions about Dysmenorrhea
Dysmenorrhea is the term used for painful menstruation. (True)
There is more than one type of dysmenorrhea. (True)
Dysmenorrhea is a type of acute cyclic pelvic pain. (True)
Mittelschmerz is a type of chronic cyclic pelvic pain. (False)
An ectopic pregnancy presents as acute noncyclic pelvic pain. (True)
Endometriosis is the most common cause of primary dysmenorrhea. (False)
Estrogen levels are inversely related to primary dysmenorrhea pain severity. (False)
Cigarette smokers have the same incidence of dysmenorrhea as non-smokers. (False)
Dysmenorrhea is positively associated with stress & a family history of dysmenorrhea. (True)
Dysmenorrhea therapy is likely to be fully effective after the first cycle of treatment. (False)
Learning Objectives
Define dysmenorrhea and differentiate between primary and secondary disease.
Identify possible causes and risk factors for pelvic pain pathologies.
Evaluate the status of a patient with dysmenorrhea and decide on an appropriate management plan, including referral to other healthcare providers.
State goals of therapy to treat and/or prevent dysmenorrhea.
Develop an individualized, evidence-based plan by comparing available treatment options.
Provide nonpharmacologic education about dysmenorrhea.
Establish monitoring parameters and a follow-up plan to assess suggested therapies for efficacy and safety.
Goal: Provide students with the knowledge and tools necessary to provide exemplary care (OTC or prescribing consults) for patients presenting with dysmenorrhea.
Suggested Resources
Burnett M, Lemyre M. No. 345-Primary Dysmenorrhea Consensus Guideline. J Obstet Gynaecol Can. 2017;39(7):585-595.
ACOG Committee Opinion No. 760: Dysmenorrhea and Endometriosis in the Adolescent. Obstet Gynecol. 2018;132(6):e249-e258.
Nakhla N. Disorders Related to Menstruation. In: Krinsky DL, Ferreri SP, Hemstreet BA, et al., eds. Handbook of Nonprescription Drugs 20th ed. Washington, DC: American Pharmacists Association; 2020.
Kho KA, Shields JK. Diagnosis and Management of Primary Dysmenorrhea. JAMA. 2020;323(3):268-269.
Dysmenorrhea Algorithm in MAPflow
Approach to Assessment of Patients with Pelvic Pain
Lower Abdominal or Pelvic Pain
Pain can vary from mildly irritating to incapacitating
Pain is one of the most common problems affecting women of reproductive age
Pain may reflect pelvic disease but may also reflect non-gynaecological disorders that refer pain to the pelvis
Acute Pelvic Pain: Pain lasts < 3 months
Chronic Pelvic Pain: Pain lasts ≥ 3 months
Pharmacists are well-positioned to triage patients presenting with pelvic pain as a chief complaint and educate them on evidence-based therapies as well as when medical care should be consulted.
Pelvic Pain Causes
Dysmenorrhea and endometriosis are the two most common causes.
Focus of lecture will be on dysmenorrhea, it is vitally important to understand (and be able to rule out) the other conditions that can present similarly
Cyclic pelvic pain
Dysmenorrhea
Endometriosis
Mittelschmerz (mid-cycle pain during follicle rupture)
Noncyclic pelvic pain
Pelvic inflammatory disease
Ruptured or hemorrhagic ovarian cyst, endometrioma, or ovarian torsion
Ectopic pregnancy
Endometritis
Acute growth or degeneration of uterine myoma
Threatened abortion
Pelvic congestion syndrome
Adhesions and retroversion of the uterus
Pelvic malignancy
Vulvodynia
Chronic pelvic inflammatory disease
Tuberculous salpingitis
History of sexual abuse
Condition Overview - Dysmenorrhea
Dysmenorrhea is the most common gynecologic problem among adolescent and young adult women.
Occurs 93% of women
Goes down at more birth
Dysmenorrhea Classification
Primary Dysmenorrhea
Women goes a die after
Irregular preggo birth pattern
No ovulation occurs
Older individuals
No obvious family history
Cause of young
Strong pain, just no family history, random
Impact on Quality of Life
Dysmenorrhea is the leading cause of school absenteeism and lost working hours among adolescent girls and young women.
Did You Know?
Despite its high prevalence and severity, most women do not seek medical care for this condition, so it remains commonly undertreated.
Treatment has the potential to improve quality of life and decrease time lost from school or work.
6% of adolescents receive medical advice on dysmenorrhea treatment, while 70% self-treat.
Primary Dysmenorrhea Etiology
Prostaglandins
Leukotrienes
Nitric oxide?
Vasopressin?
Endometriosis is of PG related to pain
NSAIDS to control PG related pain
Lysing contributes 3- Loot
2.4 times highs in women with dysmenorrhea
Clinical Presentation
Cyclic pain with menstruation
Range of symptoms
Lower mid-abdominal pain or cramping
Nausea/vomiting
Dizziness
Diarrhea
Headache
Pain occurs a few hours before or just after menstruation begins and lasts 48-72 hours.
Pain is most intense over lower abdomen but may radiate to the back & inner thighs.
Role of Other Factors
Risk Factors
Young age (<30)
Nulliparity
Early menarche
Smoking
Stress
Positive family history
Protective Factors
Exercise
Higher parity
Use of hormonal contraceptives, especially if they have not had a pregnancy or are on birth control
Early period
Minor Ailment Service Framework
Patient requests assistance with a complaint
Is the RPh competent & knowledgeable in managing the complaint?
Is RPh intervention in the best interest of the patient?
Is the ailment within the scope of RPh?
(If no to one or more) -> Refer patient to another HCP
(If yes to all) -> Does patient consent to the minor ailment service
(If no) -> OTC consult
(If yes)->
- Evaluate the situation
- Collect history of presenting complaint, patient's health & medication history
- Collect
- Offer a private space for consultation
- Verify patient's self-diagnosis
- Assess
- Use shared decision-making to develop a care plan
- Plan results in ≥1 of the following:
- Referral
- Wait-and-see approach
- Prescribe drug and/or recommend non-pharm therapy
- Implement
- Issue the Rx (if applicable)
- Advise patient of option to fill elsewhere
- Educate patient on care plan
- Documentation & notification of patient's PCP should occur in a timely manner if drug therapy is initiated to ensure continuity of care
- Establish monitoring parameters
- Schedule and complete follow-up to evaluate safety & efficacy of care plan
- Refer to another HCP as required
Collect Questions
Obtain demographic info – patient’s age
Obtain history on presenting illness – Symptoms over a series of different menstrual cycles
- Onset of pain, location of pain, type/intensity of symptoms help you to rule out if it is primary or secondary dysmenorrhea.
Obtain patient history information
- Medical and gynecologic (menstrual, sexual, preg) history
- Medication history
- Medication allergies or sensitivities
- Social history
A focused history and assessment are usually sufficient to make the diagnosis of primary dysmenorrhea.
Information Gathering
- S
- What type of pain?
- Dull or sharp pain?
- Is this pain right now?
- Are they menstruating?
- C
- Pain severity (stabbing pain?)
- Nausea?
- Vomiting?
- H History
- Has this happened before?
- Compare to last time
- O Onset
- L Location
- A Aggravating
- R Relieving
Information Gathering
- History of the pain (aka: menstrual history)
- Age at menarche; length of time elapsed between menarche and dysmenorrhea onset
- Menstrual cycle assessment: length & regularity of cycles; last menstrual period
- Menstrual flow assessment: duration & amount of bleeding; correlation with pain symptoms
- Note: the pain in PD is similar from one cycle to the next
Information Gathering
H
- Pregnancy?
- Cardiovascular
Hypertension or gynecology need?
- Contraceptive use?
- Sexual activity use exercise?
Smoking
- Nicotine causes vasoconstriction
- Causes more pain
- Stress relieving
Analyze Gathered Info
Ascertain that presenting symptoms are characteristic of primary dysmenorrhea
Assess for patient factors that are consistent with primary dysmenorrhea
Ask if the patient has received a previous dysmenorrhea diagnosis
- Have you talked to your physician before?
Assess
Differentiate between PD and SD characteristics
Assess for presence of red flag signs and symptoms
Rule out other diagnoses
Refer
Dysmenorrhea Classification
Characteristic: Primary Dysmenorrhea vs Secondary Dysmenorrhea
Age at onset:
- 6-12 months after menarche but typically within 2 years after menarche (13-17 years of age) vs Variable but at least 2 years after menarche; (typically mid-late 20s or older or pain begins after years of normal cycles)
Cause:
- Idiopathic vs Associated with pelvic pathology
Menses:
- Regular – normal blood loss vs Irregular – menorrhagia and inter-menstrual bleeding more common
Pattern and duration of dysmenorrhea pain:
- Onset just prior to or coincident with onset of menses; pain lasting 2-3 days with each or most menses vs Vary according to cause; change in pain pattern or intensity may indicate secondary disease
Pain at other times of menstrual cycle:
- No vs Yes; may occur before, during, or after menses
Response to NSAIDs and/or OCs:
- Yes vs Depends on the cause; generally, response to OTC NSAIDs is often inadequate or absent
Other possible associated symptoms:
- Fatigue, HA, nausea, dizziness, backache, irritability, depression, and changes in appetite may occur at the same time as dysmenorrhea pain vs Vary according to cause of secondary dysmenorrhea; may include dyspareunia, pelvic tenderness
If patient is old, takes contraceptive but stop it, then it's SD
Myes of is at 25 bi contraceptives could ve masked symptons
- Patient is 25
- Do NOT refer immediately
Pelvic Pain: Differential Diagnosis
- Patient is 25
Type of Condition & Examples:
- Other gynecologic conditions
- Primary Dysmenorrhea
- Mittelschmerz
- Pregnancy
- Spontaneous abortion
- Life- or organ-threatening conditions
- Ectopic pregnancy
- Acute placental abruption
- Appendicitis
- Uterine rupture
- Ovarian and fallopian tube torsion
- Pelvic trauma
- Non-gynecological causes of pelvic pain (Genitourinary)
- Interstitial cystitis
- Urinary tract infection
- Urolithiasis
- Non-gynecological causes of pelvic pain (Bowel)
- Irritable bowel syndrome
- Inflammatory bowel disease
- Constipation
- Adhesions (from previous surgeries)
- Secondary dysmenorrhea
- Endometriosis
- Adenomyosis
- Leiomyoma (fibroids)
- Ovarian cysts and tumors
- Cervical stenosis
- Salpingitis
- Pelvic inflammatory disease
- Pelvic congestion syndrome
- Congenital malformations
- Insertion of intrauterine device (IUD) within last 6 months
- Obstructive anomaly of the reproductive tract (hymenal, vaginal, or müllerian)
- Non-gynecological causes of pelvic pain (Musculoskeletal)
- Hernia
- Fibromyalgia
- Myofascial pain
- Neuropathic pain
- Pelvic floor myalgia
- Abdominal wall muscle strain
- Non-gynecological causes of pelvic pain (Psychological)
- Anxiety, depression
- Physical, emotional, sexual abuse
- Somatization
- Substance use
Differential Diagnosis (cont’d)
- Other gynecologic conditions
Condition
- Endometriosis
- Pain extends to premenstrual or postmenstrual phase or may be continuous; Onset is usually in the 20s or 30s but may start in teens; Deep dyspareunia, premenstrual spotting, infertility
- Estrogen dependent so pain gets worse where estrogen is low
- Most common cause
- Pain extends to premenstrual or postmenstrual phase or may be continuous; Onset is usually in the 20s or 30s but may start in teens; Deep dyspareunia, premenstrual spotting, infertility
- Adenomyosis
- Pain (in 25% of women) is sharp, knife-like +/- severe cramping during menstruation
- Abnormal uterine bleeding (in 60% of women), infertility
- Chronic baneigh
- Pain (in 25% of women) is sharp, knife-like +/- severe cramping during menstruation
- Leiomyoma (fibroids)
- Pain is associated with a dull pelvic dragging sensation
- Enlarged abdomen
- Being tumour
- Risk of infertility
- If not tectect: scantissue dalopment
- Pain is associated with a dull pelvic dragging sensation
- Pelvic inflammatory disease (PID)
- Pain may initially be menstrual, but often extends into the premenstrual phase with each cycle
- May have intermenstrual bleeding, dyspareunia
- Infection of Lormine of pelvic orasvarius, utters
- Pain may initially be menstrual, but often extends into the premenstrual phase with each cycle
Patient Assessment: Red Flags
- Endometriosis
Fever, chills, or other signs of a systemic infection
Intrauterine device insertion in the last 6 months
- IVD Lit can dislodge + pierce causing pain, maybe not be sterile procedure infection)
Pain occurs outside the first 3 days of menses or persisting for more than 5 days
Sudden onset of pain with bleeding or menarche
Unilateral or non-midline abdominal or pelvic pain
Patient reports palpable abdominal or pelvic lump
Changes in severity or pattern of the pain and menstrual fluid
Gynecological symptoms (e.g., amenorrhea, menorrhagia, dyspareunia, post-coital bleeding)
- (not getting period bleeding a lot pain during course bleeding everytime you have intercourse)
New onset of pain with bleeding in patient with history of pain-free periods
Plan
Canadian study of women treating PD
- 77% nonRx analgesics
- 14% Rx analgesics
- 14% used oral contraceptives
- 14% NHPs
- 40% heat
- 14% did nothing
Many women self-treat their menstrual pain using non-prescription agents, they frequently undertreat, which can negatively impact their quality of life
Goals of Therapy
Symptom resolution or improvement
Minimize the disruption of usual activities
Suppress disease progression
Identify patients who may have underlying issues requiring further medical evaluation
Pharmacotherapy Plan
1st line options: NSAIDs and hormonal contraceptives
Treatment choice influenced by:
- Hormonal contraception desire
- Previous medication experience(s)
- Contraindications to medication use
- Risk-to-benefit ratio
- Other patient preferences (e.g., cost)
For most women, drug therapy is required, and non-pharmacologic measures are used adjunctively
- Pharmacists can only Edfornsaid-G- prescribe for NSAID
Treatment Algorithm
Is contraception desired?
Is NSAID contraindicated?
Is NSAID therapy warranted and desired?
3-7 is rating
37 is rating severe
Nonpharmacologic Adjunctive Therapy
Exercise
Tobacco cessation
Topical heat therapy
- Vasodilation
Transcutaneous electrical nerve stimulation (TENS)
Stress
150mins/week ->not full cessutiv can help too increase blood flow
Heat works quickly ->becoming bigger not a lot of evidence
.be
Clinical Pearls
A pelvic examination is not necessary prior to initiating therapy.
Regular exercise is likely to improve dysmenorrhea symptoms.
Always recommend local heat as adjunctive dysmenorrhea therapy.
Nonprescription Pharmacologic Therapy
- First line options:
- Ibuprofen
- mg every 6 to 8 hours, maximum daily dose mg/day
- Naproxen sodium
- mg every 8 to 12 hours, maximum daily dose mg/day
- Ibuprofen
- Second line options (Used for mild primary dysmenorrhea):
- Ibuprofen + Acetaminophen
- mg: 2 tabs every 8 hours (6 tablets)
- mg: 2-3 tabs every 6 hours (12 tablets)
- Ibuprofen + Acetaminophen
FDC analgesics
- Ibuprofen 125 mg + Acetaminophen 250 mg
- Take 2 tablets TID. Maximum daily dose = 6 tablets.
- If a patient has tried acetaminophen and had some or good success for PD, you may consider switching to this fixed dose combination analgesic as it contains a first- line therapeutic agent (ibuprofen) and is indicated for mild pain. Combogesic is a Schedule II agent.
- Take 2 tablets TID. Maximum daily dose = 6 tablets.
- Take 1-2 tablets QID. If pain does not respond to 2 tablets, 3 tablets may be taken at subsequent doses. Maximum daily dose = 12 tablets. If a patient has tried acetaminophen and had some or good success for PD, you may consider switching to this fixed dose combination analgesic as it contains a first-line therapeutic agent (ibuprofen) and is indicated for mild-to-moderate pain.
- Fixed doe
Nonprescription Pharmacologic Therapy
- Second line options (Used for mild primary dysmenorrhea):
- Acetaminophen
- mg every 4 to 6 hours, maximum daily dose mg/day
- Aspirin
- mg every 4 to 6 hours, maximum daily dose mg/day
- Acetaminophen
Nonprescription Pharmacologic Therapy (First and Second Lines)
- First line options:
- Ibuprofen: mg every 6 to 8 hours, maximum daily dose mg/day
- Naproxen sodium
- Second line options:
- Acetaminophen: mg every 4 to 6 hours, maximum daily dose mg/day
Extra Strength Menstrual Midol® Complete contains:
Acetaminophen mg
Caffeine mg
Pyrilamine maleate mg
The adult dose is 2 caplets with water, every 4 hours as needed.
Do not exceed 8 caplets per day as it is hazardous. If symptoms persist for more than 5 days, see your doctor.Teen Midol® Complete contains:
- Acetaminophen mg
- Caffeine mg
- Pyrilamine maleate mg
The dose for adults 12 years and older is 2 caplets with water, every 4 hours as needed. Do not exceed 12 caplets per day as it is hazardous. If symptoms persist for more than 5 days, see your doctor.
Extra Strength PMS Midol® Complete contains:
- Acetaminophen mg
- Pamabrom mg
- Pyrilamine maleate mg
The adult dose is 2 caplets with water at the first sign of discomfort, usually 4 to 6 days prior to menstruation. Repeat every 4 hours as needed. Do not exceed 8 caplets per day as it is hazardous.
If symptoms persist for more than 5 days, see your doctor.
Maximum Strength Pamprin® Menstrual Pain Relief contains:Acetaminophen mg
Pamabrom mg
Pyrilamine maleate mg
Tylenol® Menstrual:
Not helpful for menstral crumpPrescription Pharmacologic Therapy
Used for moderate primary dysmenorrhea
- NSAIDs
- Combined Oral Contraceptives (COCs)
First-line for patients seeking contraceptionContinuous use of COCs is often successful if cyclic use fails
Combination of NSAID + COC
- This combo therapy will fail ~10% of patients
Progestin-only Contraceptives
- Levonorgestrel intrauterine system: highly effective for PD & endometriosis pain
- Medroxyprogesterone Depot Injection: alternative in women who cannot tolerate estrogen; who are >35 years; women who smoke
prescription strength
If above OtC amount, prescribe it , don't tell the them to ignore otc guidlines
Prescription Pharmacologic Therapy
Effective NSAID treatment:
- Initiated with the start of menses
- Should not be necessary for > days per month
Ontario prescribing regulations
- NSAID must fall under the following AHFS classification: Central Nervous System Agents: Analgesics and Antipyretics. Nonsteroidal Anti-inflammatory Agents. Other Nonsteroidal Anti-inflammatory Agents (28:08.04.92)
- Hormonal contraceptives are outside of the scope of Ontario pharmacists
Prescription Pharmacologic Therapy: NSAIDs
- Drug, Recommended Adult Dose, Maximum Daily Dose (Rx)
Drug , Recommended Adult Dose, ,Maximum Daily Dose (Rx)\Ibuprofen, mg every eight hours OR Loading dose of mg, then mg every 8 hours , mg/day
Mefenamic acid,Loading dose of mg initially, then mg every 6 hours , mg/day with loading dose on day 1; mg/day on subsequent days
Naproxen base (immediate release),Loading dose of mg initially, then mg every 6 to 8 hours OR mg BID, mg/day with loading dose on day 1; mg/day on subsequent days
Naproxen sodium,Loading dose of mg initially, then mg every 6 to 8 hours OR DS tablet: mg BID, mg/day
Ketoprofen (immediate release), mg TID-QID , mg per dose, mg/day
Diclofenac potassium,Loading dose of mg, then mg every 6 to 8 hours ,mg/day with loading dose on day 1; mg/day on subsequent days
Flurbiprofen, mg QID, mg/day
Clinical trials do this -
-give 5 day supply
Prescription Pharmacologic Therapy: NSAIDs (Not Approved)
- Celecoxib
*Not Health Canada approved but studies supports it
Disclaimer for NSAIDs
*Avoid in patients with renal failure, peptic ulcer disease,
congestive heart-failure, and ASA-sensitive asthma (exception:
celecoxib).
*Use cautiously in patients with pre-existing CVD, cerebrovascular
disease, or those with risk factors for cardiovascular disease (e.g.,
hypertension, hyperlipidemia, diabetes mellitus and smoking).Prescription Pharmacologic Therapy: Other
*Drug Class and Agent(s)
*Combined hormonal contraceptives (CHCs) Combined oral contraceptive (COC) pills or the vaginal ring are ideal first-line options for women wishing for contraception Continuous or extended-cycle regimens decrease menstrual period frequency and may result in a more rapid onset of pain reduction, thus are generally preferable to cyclic regimens. The patch is also useful but may not be as effective at relieving dysmenorrhea as COC
*Progestin-only medications
*Levonorgestrel intrauterine device (IUD)
*Etonogestrel implantable rod Approved in Canada in 2020 but not indicated for dysmenorrhea (used off-label)
*Depot medroxyprogesterone is a treatment option for women who cannot tolerate estrogen and in those >35 y/o. It may also be used for SD treatment. To promote overall bone health, encourage adequate calcium (total of 1200 mg elemental calcium from all sources) and vitamin D supplementation (1000 IU daily) in women on DMPA therapyClinical Pearls
- NSAID must fall under the following AHFS classification: Central Nervous System Agents: Analgesics and Antipyretics. Nonsteroidal Anti-inflammatory Agents. Other Nonsteroidal Anti-inflammatory Agents (28:08.04.92)
*NSAIDs administered with regular dosing regimens should be considered first-line treatment for most women.
*All currently available NSAIDs are of comparable efficacy and safety.
*Select hormonal contraceptives should be offered to women who are not currently planning pregnancy.
Opposite wire ImataPine
# Natural Health Products
- Product Recommended Adult Dose, Comments
- Ginger mg during the first 3 to 4 days of, Hest evidence may cause diareah
Thiamine (Vitamin B1) 100 mg/day for 3 months, protectioe
Magnesium 360 mg starting three days before the period has begun.Lacing protection
Fish oils 1000 mg of EPA and 720 mg DHA; Takes up to 3, Omega 6 precisor of period , exca need cramps
Cholcalciferol (Vitamin D3) A single 300,000 IU dose of cholecalciferol 5 days before menses.Women should be counseled to ingest the RDA
*Pharmacotherapeutic Comparison
It is unknown whether NSAIDs or COCs are superior to one another in treating dysmenorrhea The combination may be beneficial but will fail ~10-20% of patients
Ask about previously tried therapies
Patients may perfer to:
- use an NSAID they are familiar with
- try another agent if adverse effects were experienced previously