Reproductive System Medicines: EMT Emergencies

Reproductive System Medicines: Contraception, Obstetric Emergencies and Safety

Why this topic matters in emergency medical care

Reproductive-system medicines influence ovulation, implantation, uterine contraction, cervical ripening, labour, bleeding, infection, lactation and sexual health. In emergencies, EMTs may encounter postpartum haemorrhage, ectopic pregnancy, eclampsia, sepsis, abortion complications, sexual assault or contraceptive adverse effects. The priorities are respectful assessment, privacy, ABCDE stabilisation, pregnancy-aware medication safety and rapid referral.

This lesson is for EMT and nursing education. Follow current Uganda Ministry of Health, WHO, obstetric and facility protocols; do not improvise doses or routes during pregnancy emergencies.

Learning outcomes

Explain the hypothalamic–pituitary–gonadal axis and hormone targets in reproductive pharmacology.
Classify hormonal contraceptives, emergency contraception, uterotonics, tocolytics, fertility medicines, anti-infectives and sexual-health medicines.
Recognise and initially manage postpartum haemorrhage, ectopic pregnancy, eclampsia, sepsis, abortion complications and anaphylaxis to reproductive medicines.
Apply pregnancy, breastfeeding, thrombosis, hypertension, liver disease and drug-interaction precautions.
Provide non-judgemental counselling, protect confidentiality and document medicines and consent accurately.

1. Reproductive physiology and medicine targets

Axis/target	Physiological role	Medicine examples	Emergency relevance
GnRH–FSH/LH axis	Follicle development, ovulation and gonadal hormone production	GnRH analogues, gonadotropins, combined contraceptives	Ovulation medicines can cause ovarian hyperstimulation and ectopic/multiple pregnancy.
Oestrogen/progestin receptors	Cycle control, endometrial stability and pregnancy support	COCs, POPs, implants, injectables, hormone replacement	Oestrogen increases venous thrombosis risk in susceptible patients.
Progesterone receptors	Suppress ovulation, thicken cervical mucus and alter endometrium	Levonorgestrel, medroxyprogesterone, progesterone	Irregular bleeding, mood effects and delayed fertility return with some methods.
Oxytocin receptors	Uterine contraction and milk ejection	Oxytocin, carbetocin	Prevention/treatment of postpartum haemorrhage; water intoxication and uterine hyperstimulation.
Prostaglandin receptors	Cervical ripening, uterine contraction, vasodilation	Misoprostol, dinoprostone, carboprost	Uterotonic effect; fever, diarrhoea, bronchospasm or uterine rupture risk.
Calcium/magnesium neuronal transmission	Neuromuscular excitability and seizure threshold	Magnesium sulfate	Prevention/treatment of eclamptic seizures; toxicity depresses reflexes and breathing.

2. Practical classification of reproductive medicines

Group	Examples	Main role	High-risk concern
Combined hormonal contraceptives	Ethinylestradiol/levonorgestrel and related COCs, patch, ring	Pregnancy prevention and cycle control	Venous thrombosis, stroke, hypertension and smoking-related risk
Progestin-only methods	POP, implant, depot medroxyprogesterone, levonorgestrel IUS	Long-acting or short-acting contraception	Irregular bleeding, injection timing, ectopic pregnancy warning with failure
Emergency contraception	Levonorgestrel, ulipristal, copper IUD	Prevent pregnancy after unprotected sex	Timing, drug interactions, vomiting and need to exclude established pregnancy
Uterotonics	Oxytocin, carbetocin, misoprostol, ergometrine, carboprost	Prevent/treat postpartum haemorrhage, induce labour under protocol	Hypertension, bronchospasm, hyperstimulation and retained placenta
Antihypertensive/eclamptic medicines	Magnesium sulfate, labetalol, hydralazine, nifedipine	Prevent seizures and control severe hypertension	Respiratory depression, hypotension and fetal/maternal monitoring
Anti-infectives	Benzathine penicillin, ceftriaxone, metronidazole, azithromycin	STIs, pelvic infection and obstetric sepsis	Allergy, resistance, pregnancy safety and partner management

3. Combined hormonal contraceptives

Combined oral contraceptives (COCs) contain an oestrogen and a progestin. They prevent ovulation, thicken cervical mucus and alter the endometrium. They are effective when taken consistently but do not protect against STIs; condoms are required for STI prevention.

Benefit	Common effects	Serious warning	Screening point
Reliable reversible contraception	More predictable bleeding, reduced dysmenorrhoea	VTE: unilateral leg swelling, chest pain, sudden dyspnoea	Blood pressure, migraine with aura, smoking/age, VTE history and postpartum status
Cycle suppression	Nausea, breast tenderness, spotting	Stroke or myocardial infarction symptoms	Hypertension, thrombophilia, vascular disease and interacting enzyme inducers
Emergency pill backup	Temporary nausea or bleeding change	Persistent abdominal pain or pregnancy symptoms	Confirm timing, vomiting, drug interactions and pregnancy risk

3.1 When combined methods require caution

Current or previous venous thromboembolism, thrombophilia, stroke, ischaemic heart disease or severe hypertension.
Migraine with aura, heavy smoking at older age, active liver disease or breast cancer.
Early postpartum period, especially when breastfeeding or thrombosis risk is high.
Enzyme-inducing antiseizure medicines, rifampicin/rifabutin and some antiretrovirals can reduce effectiveness.

4. Progestin-only contraception

Method	Medicine/action	Advantages	Emergency/teaching point
Progestin-only pill	Daily progestin suppresses ovulation and thickens mucus	Suitable for many people who cannot use oestrogen	Strict timing varies by product; missed-pill guidance is method-specific.
Implant	Etonogestrel or levonorgestrel release over years	Highly effective, long-acting and reversible	Irregular bleeding is common; pain or infection at insertion site needs review.
Depot injection	Medroxyprogesterone suppresses ovulation for months	Private, effective and less user-dependent	Delayed fertility return, weight/mood changes and bone-density considerations.
Levonorgestrel IUS	Local progestin thickens mucus and thins endometrium	Long-acting, lighter bleeding	Severe pain, fever, heavy bleeding or missing strings may indicate complication.

5. Emergency contraception

Emergency contraception prevents or delays ovulation after unprotected intercourse; it does not terminate an established intrauterine pregnancy. WHO options include levonorgestrel, ulipristal acetate and a copper IUD. A copper IUD inserted within five days is highly effective and provides continuing contraception.

Ask when unprotected sex occurred, current method, last menstrual period, breastfeeding, vomiting and enzyme-inducing medicines.
Exclude symptoms of ectopic pregnancy or established pregnancy; emergency contraception does not treat ectopic pregnancy.
Give the authorised product as soon as possible; ulipristal and levonorgestrel have different interaction and restart rules.
Advise what to do if vomiting occurs, when to test for pregnancy and how to start or resume ongoing contraception.
Provide STI and safeguarding assessment when appropriate, with privacy and consent.

6. Contraceptive interactions and missed doses

Situation	Risk	Response
Enzyme-inducing antiseizure drug	Reduced hormonal contraceptive levels	Use a method unaffected by enzyme induction or specialist guidance; do not rely on guesswork.
Vomiting/diarrhoea after oral dose	Reduced absorption	Follow product-specific missed-dose advice and consider emergency contraception.
Missed COC/POP doses	Ovulation and pregnancy risk	Identify number/timing of missed pills and use the correct protocol.
Ulipristal then immediate hormonal restart	Progestin can reduce ulipristal effect	Follow the recommended delay and barrier method guidance.

7. Uterotonics and postpartum haemorrhage

Postpartum haemorrhage requires simultaneous recognition, uterine assessment, resuscitation, uterine massage, search for trauma/retained tissue/coagulopathy and urgent escalation. A quality-assured uterotonic is used according to the national protocol; medicine choice depends on contraindications and availability.

Medicine	Action	Important contraindication/caution
Oxytocin	Contracts uterine muscle; common first-line uterotonic	Rapid IV bolus can cause hypotension; excessive infusion may cause water intoxication and hyponatraemia.
Carbetocin	Longer-acting oxytocin analogue	Use according to prevention protocol; monitor BP, uterine tone and adverse effects.
Misoprostol	Prostaglandin E1 analogue; uterine contraction and cervical ripening	Fever, shivering, diarrhoea; route and indication are protocol-specific.
Ergometrine/methylergometrine	Powerful sustained uterine contraction	Avoid in hypertension, pre-eclampsia, eclampsia and significant vascular disease.
Carboprost	Prostaglandin F2α analogue for uterine atony	Avoid/caution in asthma; diarrhoea, vomiting and bronchospasm may occur.
Tranexamic acid	Antifibrinolytic stabilises clot	Give early in PPH according to protocol; consider thromboembolic history and renal function.

7.1 EMT response to PPH

Call for help, quantify bleeding where possible and assess airway, breathing, circulation, mental state and shock.
Uterine massage if trained and indicated; inspect for retained placenta/trauma without delaying transfer.
Establish two large-bore IV lines if trained, take blood samples, warm the patient and begin authorised fluid/blood protocol.
Administer the correct uterotonic and early tranexamic acid only under local protocol; check BP/asthma history before ergometrine/carboprost.
Transfer urgently to a facility with obstetric, blood-bank and surgical capability; communicate time, blood loss, tone, placenta status and medicines.

8. Magnesium sulfate and eclampsia

Magnesium sulfate is the medicine of choice in many protocols for preventing and treating eclamptic seizures. It depresses neuromuscular transmission and reduces seizure recurrence. It is not an antihypertensive; severe BP requires a separate authorised medicine and urgent obstetric care.

Check	Before/during magnesium	Toxicity warning
Respiration	Count respiratory rate and assess work of breathing	Respiratory depression or apnoea
Reflexes	Check patellar/deep tendon reflexes when feasible	Absent reflexes may precede severe toxicity
Urine output	Monitor renal function and hourly output in hospital care	Accumulation in oliguria/renal failure
Antidote readiness	Calcium gluconate/chloride protocol and airway support available	Calcium treats toxicity while ventilation and urgent transfer continue

9. Medicines for severe hypertension in pregnancy

Medicine	Role	Safety point
Labetalol	Rapid BP control through alpha/beta blockade	Bradycardia, bronchospasm, heart failure or fetal effects require assessment.
Hydralazine	Direct arteriolar vasodilator	Hypotension, tachycardia and headache; titrate under monitored protocol.
Nifedipine	Calcium-channel blocker for urgent oral BP control	Flushing, headache and hypotension; avoid unsafe rapid-release improvisation.
ACE inhibitors/ARBs	Not for pregnancy hypertension	Fetal renal injury and oligohydramnios risk; check medication history urgently.

10. Fertility medicines and ovarian hyperstimulation

Gonadotropins and ovulation-induction medicines are prescribed in specialist fertility care. Ovarian hyperstimulation syndrome (OHSS) can cause enlarged ovaries, abdominal pain, vomiting, ascites, haemoconcentration, thrombosis and renal injury. Severe breathlessness, reduced urine, sudden abdominal distension or chest pain requires emergency referral.

Ask about recent fertility injections or assisted reproduction in any reproductive-age patient with abdominal pain and vomiting.
Do not assume pelvic pain is gastroenteritis; pregnancy, ectopic pregnancy, torsion and OHSS are time-critical alternatives.
Monitor perfusion, urine output, weight, abdominal girth and respiratory status under specialist care.

11. Reproductive tract infection and STI medicines

STIs require confidential, non-judgemental history-taking, testing, treatment and partner services. Antibiotic selection follows current WHO and national guidance, pregnancy status, allergy and local resistance. Condoms reduce STI transmission; contraception alone does not.

Infection/syndrome	Medicine principles	Safety/teaching
Syphilis	Benzathine penicillin is central to treatment, including pregnancy protocols	Check allergy and observe for reaction; treat partners and prevent congenital infection.
Gonorrhoea	Use current ceftriaxone-based or national regimen	Resistance is increasing; test/treat partners and screen for chlamydia/HIV.
Chlamydia	Doxycycline or azithromycin according to site, pregnancy and guideline	Pregnancy changes choice; partner treatment and abstinence until treated matter.
Trichomoniasis/BV	Metronidazole or alternatives	Alcohol interaction advice and pregnancy/partner guidance are important.
Pelvic inflammatory disease	Broad-spectrum combination treatment	Urgent referral for severe pain, fever, pregnancy, vomiting or tubo-ovarian abscess concern.

12. Medicines in abortion complications and ectopic pregnancy

Misoprostol and mifepristone have specific indications and must be used within authorised, legally compliant services. EMTs should not improvise termination regimens. Heavy bleeding, shock, severe unilateral pain, shoulder-tip pain, syncope or positive pregnancy with abdominal pain may indicate ectopic pregnancy or haemorrhage.

Assess ABCDE, pregnancy possibility, bleeding amount, pain, last menstrual period and previous ectopic/sterilisation.
Keep the patient warm, establish access, monitor and treat shock under protocol.
Do not give oral medicines or food to an unstable patient or delay surgical referral.
Communicate any misoprostol/mifepristone, anticoagulant or herbal medicine exposure confidentially and accurately.

13. Lactation and postpartum medicine safety

Ask whether the patient is breastfeeding before giving sedatives, opioids, antibiotics or hormonal medicines.
Use prescribed compatible medicines where possible; monitor the infant for sedation, poor feeding, diarrhoea or jaundice when risk exists.
Opioids can depress both mother and infant; use the lowest effective prescribed dose and avoid unsupervised combinations.
Postpartum fever, offensive lochia, wound pain, breast infection, severe headache or hypertension require assessment for sepsis or pre-eclampsia.

14. Clinical scenarios

Scenario 1: Postpartum haemorrhage

After delivery, a patient has heavy bleeding and a boggy uterus. Call help, perform ABCDE, massage the uterus if trained, establish access, give protocol uterotonic/tranexamic acid after contraindication checks, resuscitate and transfer urgently.

Scenario 2: Eclampsia

A pregnant patient has a seizure and severe BP. Protect airway and injury, give magnesium sulfate under protocol, treat severe hypertension with an authorised medicine, check glucose and arrange urgent obstetric transfer.

Scenario 3: Ectopic pregnancy

A reproductive-age patient has unilateral abdominal pain, dizziness and light vaginal bleeding. Treat shock, avoid false reassurance, ask pregnancy history and transfer urgently for ectopic assessment.

Scenario 4: Combined contraceptive and thrombosis

A patient using a COC develops sudden dyspnoea and pleuritic chest pain. Consider pulmonary embolism, assess ABCDE and transfer urgently; do not dismiss symptoms as anxiety or a pill side effect.

Scenario 5: Misoprostol exposure with heavy bleeding

A patient reports taking misoprostol and is soaking pads with dizziness. Quantify bleeding, stabilise, protect privacy and refer urgently; do not interrogate or delay care.

Scenario 6: STI with pregnancy

A pregnant patient has pelvic pain, fever and discharge. Treat as possible PID/obstetric infection, use pregnancy-safe protocol and arrange urgent review rather than self-prescribing leftover antibiotics.

15. Documentation, consent and confidentiality

Document pregnancy status, last menstrual period, breastfeeding, method and last contraceptive dose, allergies, sexual-health concerns, medicine name/strength/route/time, bleeding estimate, vital-sign trends, consent and referral. Use private language, avoid judgement, protect records and disclose information only within lawful clinical need.

16. Revision questions

Compare combined and progestin-only contraceptives.
Which contraceptive method also protects against STIs?
What factors reduce emergency contraceptive effectiveness?
List contraindications/cautions for combined hormonal contraception.
Explain the roles of oxytocin, misoprostol, ergometrine and carboprost.
Why is ergometrine avoided in severe hypertension/eclampsia?
What are the signs of postpartum haemorrhage and shock?
What observations are needed during magnesium sulfate therapy?
How is magnesium toxicity managed in principle?
List emergency symptoms of ectopic pregnancy.
Why must STI treatment include partner services and prevention?
What risks should be discussed with breastfeeding patients receiving opioids?
What is OHSS and which signs require urgent referral?
Why should ACE inhibitors/ARBs be reviewed urgently in pregnancy?
How should reproductive emergencies be documented confidentially?

17. Key takeaways

Privacy, consent, pregnancy status and ABCDE assessment are essential in every reproductive emergency.
IM/IV uterotonics, tranexamic acid and resuscitation save lives in postpartum haemorrhage; check contraindications and do not delay transfer.
Magnesium sulfate prevents/treats eclamptic seizures but requires respiratory, reflex and urine monitoring.
Contraception prevents pregnancy but does not protect against STIs except condoms.
Heavy bleeding, shock, ectopic symptoms, sepsis and severe hypertension require urgent referral, not symptom-only treatment.
Use current national/WHO protocols for contraception, STI therapy, pregnancy and breastfeeding.

18. Recommended references for further study

Clinical note: This page supports EMT learning and revision. It does not replace an authorised prescription, local obstetric protocol, senior supervision or patient-specific advice. In a deteriorating patient, stabilise ABCDE, call for advanced help and transfer urgently.