For most healthy adults, an IV drip given by a licensed clinician after proper screening is low-risk. But “low-risk” isn’t “no risk.” An IV bypasses every protective barrier your body has — your skin, your gut, your liver’s first pass — so the screening and the person holding the catheter matter a great deal.
Texas learned this the hard way. In 2023, a 47-year-old woman died after receiving an IV vitamin infusion at a spa where the supervising physician did not properly oversee the unlicensed person who gave it. Her death led to Jenifer’s Law, which took effect in 2025.
Common, minor side effects
These are expected and usually fade within hours:
- Bruising, soreness, or a small bump where the catheter went in
- A cool feeling moving up the arm as room-temperature fluid enters
- A metallic or vitamin taste in the mouth (common with B vitamins)
- Warmth or flushing — typical with magnesium, especially if it runs quickly
- Bright yellow urine afterward — riboflavin (vitamin B2) in B-complex, harmless
- Lightheadedness — sometimes a fainting reflex triggered by needles (vasovagal reaction)
Less common but serious complications
| Complication | What happens | Who’s most at risk |
|---|---|---|
| Infiltration / extravasation | Fluid leaks into tissue around the vein, causing swelling and pain | Fragile veins; poorly secured IV |
| Phlebitis | Inflammation of the vein — redness, tenderness along its path | Irritating ingredients, longer infusions |
| Infection | Bacteria enter at the insertion site or through contaminated product | Poor sterile technique, improperly compounded bags |
| Fluid overload | Too much fluid for the heart or kidneys to handle → swelling, shortness of breath | Heart failure, kidney disease, older adults |
| Electrolyte imbalance | Sodium, potassium, or magnesium levels shift too far | Kidney disease; repeated frequent infusions |
| Allergic reaction / anaphylaxis | Hives, wheezing, throat swelling, low blood pressure | Anyone — rare, but a clinic must be equipped to respond |
| Hemolysis | Red blood cells break down | People with G6PD deficiency receiving high-dose vitamin C |
| Drug side effects | From add-ons like ketorolac (kidney, stomach bleeding) or ondansetron (heart rhythm) | People with kidney, GI, or heart conditions; drug interactions |
Who should avoid elective IV therapy (or get a doctor’s approval first)
- Heart failure or significant heart disease — extra fluid can tip you into overload
- Kidney disease — kidneys clear the fluid, electrolytes, and vitamins
- Uncontrolled high blood pressure
- G6PD deficiency — high-dose vitamin C can cause dangerous hemolysis; ask to be tested before high-dose C
- History of kidney stones — high-dose vitamin C raises oxalate
- Pregnancy or breastfeeding — the Merck Manual notes safety of IV vitamin therapy in pregnancy hasn’t been studied; IV fluids for severe pregnancy nausea are a medical treatment your OB should direct
- Known allergies to any ingredient, or to preservatives such as those in some vitamin vials
- Taking blood thinners, diuretics, or heart-rhythm medications — interactions are possible with several add-ons
- Diabetes using a fingerstick glucose meter — high-dose vitamin C can cause falsely high readings on some meters for hours afterward
What good screening looks like
Before your first drip, a reputable clinic should:
- Take a full health history — conditions, medications, allergies, pregnancy status, prior IV reactions
- Check vital signs — blood pressure, heart rate, temperature, sometimes oxygen
- Have a physician, PA, or nurse practitioner order the specific infusion (required in Texas for elective IVs outside physician offices and licensed facilities)
- Have an RN or higher place and monitor the IV
- Explain what’s in the bag and why, and get your informed consent
- Have emergency medications and a plan for allergic reactions on site
If a clinic lets you pick from a menu and starts the IV without most of that, walk out. See How to choose an IV clinic.
When to seek help after an IV
Call the clinic or seek urgent care if you notice spreading redness, warmth, red streaks, or pus at the IV site; fever; or a hard, painful cord along the vein. Call 911 for trouble breathing, swelling of the face or throat, chest pain, or fainting.
The bottom line
The biggest safety factor isn’t the drip — it’s the clinic. Proper screening, a licensed clinician, sterile technique, and emergency readiness make elective IV therapy low-risk for most healthy adults. Skipping any of them is how the rare bad outcomes happen.
Frequently asked questions
What are the most common side effects of IV therapy?
Bruising or tenderness at the IV site, a cool sensation in the arm, a metallic taste with some vitamins, brief flushing with magnesium, and lightheadedness. These usually resolve within hours.
Can IV therapy be dangerous?
Serious complications are uncommon when a trained clinician screens you and places the IV, but they do happen — including fluid overload, severe allergic reactions, infection, and electrolyte problems. Proper screening and supervision are what keep the risk low.
Who should not get IV vitamin therapy?
People with heart failure, significant kidney disease, uncontrolled high blood pressure, G6PD deficiency (for high-dose vitamin C), known allergies to ingredients, and anyone pregnant or breastfeeding should not get elective IV therapy without a physician's specific approval.