Question 1

What is hydralazine?

Accepted Answer

HydrALAZINE hydrochloride, USP, is an antihypertensive, for oral administration. Its chemical name is 1 -hydrazinophthalazine monohydrochloride, and its structural formula is: C 8 H 8 N 4 .HCl HydrALAZINE hydrochloride, USP is a white to off-white, odorless crystalline powder. It is soluble in water, slightly soluble in alcohol, and very slightly soluble in ether. It melts at about 275oC, with decomposition, and has a molecular weight of 196.64. Each tablet for oral administration contains 10 mg, 25 mg, 50 mg or 100 mg hydrALAZINE hydrochloride, USP. Tablets also contain anhydrous lactose, microcrystalline cellulose, sodium starch glycolate, stearic acid and FD&C Yellow # 6. 0801cbcc-figure-01

Question 2

What kind of drug is hydralazine?

Accepted Answer

The FDA classifies hydralazine as an arteriolar vasodilator. If you are checking whether it is safe to combine with something else, the class is what matters — two drugs from the same class usually should not be stacked.

Question 3

Can you take hydralazine with other medicines?

Accepted Answer

It depends on the medicine. We check it against the FDA labels rather than guessing: our interaction checker searches each drug's own label for the other and quotes what it says, naming the section it came from. Run hydralazine against whatever else you take — and remember that a label not naming a drug is not the same as that combination being safe.

Question 4

What brand names is hydralazine sold under?

Accepted Answer

We track 2 hydralazine-containing products in the U.S.: Apresoline and Hydralazine Hydrochloride. They are the same active ingredient; they differ in form, manufacturer, price and FDA recall record.

Question 5

What forms does hydralazine come in?

Accepted Answer

Across the brands we track, hydralazine is currently marketed as tablet, injectable and solution, per the FDA's National Drug Code Directory. Each form is dosed differently — follow the label for the exact product you were prescribed.

Question 6

Is there a generic hydralazine?

Accepted Answer

Yes. Our catalog lists 1 generic hydralazine product alongside the brand versions. A generic has the same active ingredient and must meet the FDA's bioequivalence standard; it usually costs less. Ask your pharmacist which one your plan covers.

Question 7

Has hydralazine been recalled?

Accepted Answer

The FDA's Enforcement database lists at least 5 recall records whose product description mentions hydralazine. The most recent: HydrALAZINE Hydrochloride (Jan 24, 2025). A recall applies to specific lots, not to the drug as a whole — check the record for the affected lot numbers.

#	Drug	Rating	Type	Form	Generic?	Typical price
1	Apresoline	68/100	Prescription	Tablet	Generic	$1	View →
2	Hydralazine Hydrochloride	Not yet rated	Prescription	Injectable	Generic	$1

Imprint	Strength	Colour	Shape	Maker
I3;1;2	20 mg / 37.5 mg	orange	round	—
20;N	37.5 mg / 20 mg	orange	round	—
I3;1;2	20 mg / 37.5 mg	orange	round	—
20;N	37.5 mg / 20 mg	orange	round	—
EP;101	10 mg	pink	round	—
EP;103	50 mg

Hydralazine: uses, dosing, side effects & brands

Key facts

How hydralazine is dosed

Hydralazine side effects

Who shouldn’t take hydralazine

Every hydralazine product we track (2)

What hydralazine pills look like

Combination products containing hydralazine

Hydralazine recalls

Frequently asked questions

Hydralazine drug interactions