20 Best Flea Liquid For Dogs [2024]

Are you looking for the best Flea Liquid For Dogs? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling Flea Liquid For Dogs.

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# Preview Product
1 Hartz UltraGuard Dual Action Flea & Tick Topical Dog Treatment and Flea and Tick Prevention, 6... Hartz UltraGuard Dual Action Flea & Tick Topical Dog Treatment and Flea and Tick Prevention, 6...
2 Frontline Plus Flea and Tick Treatment for Dogs (Small Dog, 5-22 Pounds, 3 Doses) Frontline Plus Flea and Tick Treatment for Dogs (Small Dog, 5-22 Pounds, 3 Doses)
3 Hartz UltraGuard Dual Action Flea & Tick Topical Dog Treatment and Flea and Tick Prevention, 3... Hartz UltraGuard Dual Action Flea & Tick Topical Dog Treatment and Flea and Tick Prevention, 3...
4 K9 Advantix II Flea and Tick Prevention for Large Dogs (21-55 Pounds), 2 Count (Pack of 1) K9 Advantix II Flea and Tick Prevention for Large Dogs (21-55 Pounds), 2 Count (Pack of 1)
5 K9 Advantix II Flea and Tick Prevention for Medium Dogs 4-Pack, 11-20 Pounds K9 Advantix II Flea and Tick Prevention for Medium Dogs 4-Pack, 11-20 Pounds
6 TevraPet Activate II Flea and Tick Prevention for Dogs | 4 Count | Medium Dogs 11-20 lbs | Topical... TevraPet Activate II Flea and Tick Prevention for Dogs | 4 Count | Medium Dogs 11-20 lbs |...
7 PetArmor Capaction Oral Flea Treatment for Small Dogs (2-25 lbs), Fast Acting, 6 Tablets PetArmor Capaction Oral Flea Treatment for Small Dogs (2-25 lbs), Fast Acting, 6 Tablets
8 Hartz UltraGuard Dual Action Topical Flea & Tick Treatment for Dogs and Puppies - 15-30lbs, 3... Hartz UltraGuard Dual Action Topical Flea & Tick Treatment for Dogs and Puppies - 15-30lbs, 3...
9 PetArmor CAPACTION (nitenpyram) Oral Flea Treatment for Dogs, Fast Acting Tablets Start Killing... PetArmor CAPACTION (nitenpyram) Oral Flea Treatment for Dogs, Fast Acting Tablets Start Killing...
10 Advantage II Flea Prevention and Treatment for Extra-Large Dogs (Over 55 Pounds), 4 Pack Advantage II Flea Prevention and Treatment for Extra-Large Dogs (Over 55 Pounds), 4 Pack
11 Hartz UltraGuard Pro Flea Tick Drops for Dogs 3160 lbs Hartz UltraGuard Pro Flea Tick Drops for Dogs 3160 lbs
12 Hartz UltraGuard Dual Action Flea & Tick Topical Dog Treatment and Flea and Tick Prevention, 6... Hartz UltraGuard Dual Action Flea & Tick Topical Dog Treatment and Flea and Tick Prevention, 6...
13 Hartz UltraGuard Dual Action Flea & Tick Topical Dog Treatment and Flea and Tick Prevention, 6... Hartz UltraGuard Dual Action Flea & Tick Topical Dog Treatment and Flea and Tick Prevention, 6...
14 Amazon Brand - Solimo Flea, Tick & Mosquito Topical for Medium Dogs (11-20 pounds), 6 Count Amazon Brand - Solimo Flea, Tick & Mosquito Topical for Medium Dogs (11-20 pounds), 6 Count
15 Seresto Flea and Tick Collar for Dogs, 8-Month Flea and Tick Collar for Large Dogs (Over 18 Pounds),... Seresto Flea and Tick Collar for Dogs, 8-Month Flea and Tick Collar for Large Dogs (Over 18...
16 PetArmor Plus for Dogs Flea and Tick Prevention for Dogs, Long-Lasting & Fast-Acting Topical Dog... PetArmor Plus for Dogs Flea and Tick Prevention for Dogs, Long-Lasting & Fast-Acting Topical Dog...
17 K9 Advantix II Flea and Tick Prevention for Extra-Large Dogs Over 55 Pounds, 2 Count (Pack of 1) K9 Advantix II Flea and Tick Prevention for Extra-Large Dogs Over 55 Pounds, 2 Count (Pack of 1)
18 BugMD Empty Refillable Spray Bottle 32 oz - for Use with BugMD Pest Control Essential Oil... BugMD Empty Refillable Spray Bottle 32 oz - for Use with BugMD Pest Control Essential Oil...
19 TevraPet Activate II Flea and Tick Prevention for Dogs | Large 21-55 lbs | 8 Monthly Doses | Fast... TevraPet Activate II Flea and Tick Prevention for Dogs | Large 21-55 lbs | 8 Monthly Doses | Fast...
20 PetArmor Plus Flea and Tick Prevention for Dogs, Dog Flea and Tick Treatment, Waterproof Topical,... PetArmor Plus Flea and Tick Prevention for Dogs, Dog Flea and Tick Treatment, Waterproof Topical,...
SaleBestseller No. 1
Hartz UltraGuard Dual Action Flea & Tick Topical Dog Treatment and Flea and Tick Prevention, 6...
  • KILLS FLEAS & TICKS: Kills fleas, flea eggs, deer ticks, and brown dog ticks on contact – it is important for your pup to have a flea and tick...
  • PREVENTS RE-INFESTATION: This topical formula prevents re-infestation by breaking the flea life cycle for up to 30 days.
  • FAST ACTING FULL BODY PROTECTION: Active ingredients spread across the skin using your dog’s natural oil to quickly travel across the coat for full...
  • 6 MONTHLY FLEA & TICK TREATMENTS: Contains 6 single dose tubes (1 tube per monthly application) for non-stop protection for up to 6 months. Apply at...
SaleBestseller No. 2
Frontline Plus Flea and Tick Treatment for Dogs (Small Dog, 5-22 Pounds, 3 Doses)
  • Waterproof flea and tick treatment for dogs: Frontline Plus for Dogs provides waterproof, fast-acting, long-lasting flea and tick treatment and...
  • Break the flea life cycle with frontline: Frontline flea and tick treatment for dogs kills adult fleas plus flea eggs and larvae to stop existing...
  • Kills fleas and ticks: Frontline flea and tick treatment for dogs kills fleas, flea eggs, lice, and ticks. This flea and tick treatment kills ticks,...
  • Trusted flea and tick protection for dogs: Frontline has been trusted by veterinarians for nearly 20 years. Made with 2 tough killing ingredients,...
  • Lasting flea and tick protection: Frontline's long-lasting formula isstored in the oil glands of the pet’s skin to give non-stop flea and tick...
SaleBestseller No. 3
Hartz UltraGuard Dual Action Flea & Tick Topical Dog Treatment and Flea and Tick Prevention, 3...
  • Fast-acting topical drop formula kills fleas, flea eggs, deer and brown dog ticks, plus prevents re-infestation for 30 days
  • Includes 3 monthly treatments in easy to apply, single dose tubes
  • This product also kills deer ticks, which may carry Lyme disease
  • For use on dogs and puppies 12 weeks or older that weigh 5-14 pounds
  • Apply at the base of the pet's back between the shoulder blades
SaleBestseller No. 4
K9 Advantix II Flea and Tick Prevention for Large Dogs (21-55 Pounds), 2 Count (Pack of 1)
  • TWO MONTH PROTECTION: 2 monthly applications of K9 Advantix II flea and tick prevention for large dogs weighing 21 to 55 pounds
  • FLEA, TICK AND MOSQUITO PROTECTION: K9 Advantix II flea and tick prevention for dogs works through contact, so fleas, ticks and mosquitoes do not have...
  • EASY TO APPLY: K9 Advantix II flea and tick control for dogs is an easy to apply topical formula
  • STARTS WORKING WITHIN 12 HOURS: Starts working to kill fleas within 12 hours and keeps working for 30 days
  • EFFECTIVE YEAR-ROUND: Suitable for effective year-round flea and tick treatment for large dogs
SaleBestseller No. 5
K9 Advantix II Flea and Tick Prevention for Medium Dogs 4-Pack, 11-20 Pounds
  • 4 monthly applications of K9 Advantix II flea and tick prevention for medium dogs weighing 11-20 pounds
  • K9 Advantix II flea and tick prevention for dogs works through contact, so fleas, ticks and mosquitoes do not have to bite your dog to die
  • K9 Advantix II flea and tick control for dogs is an easy to apply topical formula
  • Starts working to kill fleas within 12 hours and keeps working for 30 days
  • Suitable for effective year-round dog flea and tick treatment for medium dogs
SaleBestseller No. 6
TevraPet Activate II Flea and Tick Prevention for Dogs | 4 Count | Medium Dogs 11-20 lbs | Topical...
  • COMPARE TO K9 ADVANTIX II: Activate II uses Imidacloprid, Permethrin, and Pyriproxyfen - the same safe, fast acting active ingredients used in...
  • ACTIVELY PROTECTS YOUR DOG: Activate II is approved by veterinarians to repel and kill fleas and ticks on contact - before your dog is exposed to...
  • STOP INFESTATIONS FAST: Our topical drops prevent infestations by breaking the flea life cycle - our insect growth regulator (IGR) starts killing flea...
  • EASY TO APPLY: Simply apply to the base of your dog's neck, and the waterproof solution will travel across the skin - providing continuous protection...
  • MADE IN AMERICA - RESULTS GUARANTEED: TevraPet Activate II is made to the quality standard we demand for our own pets. We're proud to help you protect...
Bestseller No. 7
PetArmor Capaction Oral Flea Treatment for Small Dogs (2-25 lbs), Fast Acting, 6 Tablets
  • FAST-ACTING: One oral flea tablet starts killing fleas within 30 minutes of administration.
  • SAFE TO USE: This oral flea medication is safe for puppies and dogs from 2-25 lbs. 4 weeks and older, when used as directed.
  • TREAT RE-INFESTATIONS FAST: If your pet gets re-invested with fleas simply apply another dose as often as once a day. CapAction Flea Pills are even...
  • EASY TO USE: Without the mess and rubbing off of a flea and tick topical treatment and without the need of a veterinarian's prescription this dog flea...
  • KILL FLEAS EFFICIENTLY: CapAction flea treatment has 6 doses and kills adult fleas that may cause allergy dermatitis.
SaleBestseller No. 8
Hartz UltraGuard Dual Action Topical Flea & Tick Treatment for Dogs and Puppies - 15-30lbs, 3...
  • Fast-acting topical drop formula kills fleas, flea eggs, deer and brown dog ticks, plus prevents re-infestation for 30 days
  • Includes 3 monthly treatments in easy to apply, single dose tubes
  • This product also kills deer ticks, which may carry Lyme disease
  • For use on dogs and puppies 12 weeks or older that weigh 15-30 pounds
  • Apply at the base of the pet's back between the shoulder blades
SaleBestseller No. 9
PetArmor CAPACTION (nitenpyram) Oral Flea Treatment for Dogs, Fast Acting Tablets Start Killing...
  • FAST-ACTING: One oral flea tablet starts killing fleas within 30 minutes of administration.
  • SAFE TO USE: This oral flea medication is safe for puppies, dogs, cats, and kittens from 25lbs. and over, when used as directed.
  • TREAT RE-INFESTATIONS FAST: If your pet gets re-invested with fleas simply apply another dose as often as once a day. CapAction Flea Pills are even...
  • EASY TO USE: Without the mess and rubbing off of a flea and tick topical treatment and without the need of a veterinarian prescription this dog flea...
  • KILL FLEAS EFFICIENTLY: CapAction flea treatment has 6 doses and kills adult fleas that may cause allergy dermatitis.
SaleBestseller No. 10
Advantage II Flea Prevention and Treatment for Extra-Large Dogs (Over 55 Pounds), 4 Pack
  • 4-dose flea and lice treatment for extra-large dogs over 55 pounds
  • Advantage II dog flea treatment works through contact, so fleas don't have to bite your dog to die
  • Effective dog flea treatment kills fleas in multiple life stages (eggs, larvae and adults) to break the flea life cycle
  • Easy-to-apply flea and lice treatment for extra-large dogs starts working within 12 hours and protects for up to 30 days
  • Vet-recommended, fragrance-free and designed specifically to treat and prevent fleas and lice on dogs
Bestseller No. 11
Hartz UltraGuard Pro Flea Tick Drops for Dogs 3160 lbs
  • The patented and easy-to-use Pro-Glide angled applicator with rounded edges easily gets through dog's fur, for gentle on-skin application. Suitable...
  • Includes 3 monthly treatments in easy to apply, single dose tubes
  • Topical drop formula kills fleas, flea eggs, flea larvae, brown dog and deer ticks, prevents re-infestation, plus repels mosquitoes for 30 days
  • Starts killing fleas within 15 minutes
  • For use on dogs and puppies 12 weeks or older that weigh 31-60 pounds
SaleBestseller No. 12
Hartz UltraGuard Dual Action Flea & Tick Topical Dog Treatment and Flea and Tick Prevention, 6...
  • KILLS FLEAS & TICKS: Kills fleas, flea eggs, deer ticks, and brown dog ticks on contact – it is important for your pup to have a flea and tick...
  • PREVENTS RE-INFESTATION: This topical formula prevents re-infestation by breaking the flea life cycle for up to 30 days.
  • FAST ACTING FULL BODY PROTECTION: Active ingredients spread across the skin using your dog’s natural oil to quickly travel across the coat for full...
  • 6 MONTHLY FLEA & TICK TREATMENTS: Contains 6 single dose tubes (1 tube per monthly application) for non-stop protection for up to 6 months. Apply at...
Bestseller No. 13
Hartz UltraGuard Dual Action Flea & Tick Topical Dog Treatment and Flea and Tick Prevention, 6...
  • KILLS FLEAS & TICKS: Kills fleas, flea eggs, deer ticks, and brown dog ticks on contact – it is important for your pup to have a flea and tick...
  • PREVENTS RE-INFESTATION: This topical formula prevents re-infestation by breaking the flea life cycle for up to 30 days.
  • FAST ACTING FULL BODY PROTECTION: Active ingredients spread across the skin using your dog’s natural oil to quickly travel across the coat for full...
  • 6 MONTHLY FLEA & TICK TREATMENTS: Contains 6 single dose tubes (1 tube per monthly application) for non-stop protection for up to 6 months. Apply at...
SaleBestseller No. 14
Amazon Brand - Solimo Flea, Tick & Mosquito Topical for Medium Dogs (11-20 pounds), 6 Count
  • Repels & Kills fleas, ticks and mosquitoes, Kills flea eggs & flea larvae,Waterproof
SaleBestseller No. 15
Seresto Flea and Tick Collar for Dogs, 8-Month Flea and Tick Collar for Large Dogs (Over 18 Pounds),...
  • 8-MONTHS OF CONTINUOUS PROTECTION: Provides 8-months of continuous flea and tick prevention
  • WORKS THROUGH CONTACT: Seresto flea and tick collar for large dogs works through contact, so fleas and ticks do not have to bite your dog to die
  • VET-RECOMMENDED: Veterinarian-recommended flea and tick prevention for dogs in a convenient, odorless and non-greasy collar; No need for messy monthly...
  • STARTS WORKING WITHIN 24 HOURS: Starts to repel and kill fleas within 24 hours of initial application
  • FLEA AND TICK COLLAR: Flea and tick collar for large dogs also helps treat and control sarcoptic mange and kills lice
Bestseller No. 16
PetArmor Plus for Dogs Flea and Tick Prevention for Dogs, Long-Lasting & Fast-Acting Topical Dog...
  • EFFECTIVE, WATERPROOF FLEA TREATMENT FOR DOGS: PetArmor Plus is a waterproof, flea & tick topical prevention for dogs that kills fleas, flea eggs,...
  • TRUSTED, VET QUALITY FORMULA: Containing fipronil and (S)-methoprene, the same active ingredients as FRONTLINE Plus for Dogs. PetArmor Plus for Dogs...
  • BREAK THE FLEA CYCLE: Unlike other flea and tick treatments that may temporarily suppress flea activity, PETARMOR Plus Dog Flea Treatment works by...
  • FLEA AND TICK PROTECTION: PetArmor Plus for Dogs flea drops protects your furry family members from brown dog ticks, American dog ticks, Lone Star...
  • EASY-TO-USE, LONG-LASTING: PetArmor Plus flea and tick treatment comes with six (6) waterproof topical applications that provide your pet flea...
SaleBestseller No. 17
K9 Advantix II Flea and Tick Prevention for Extra-Large Dogs Over 55 Pounds, 2 Count (Pack of 1)
  • TWO MONTHS PROTECTION: 2 monthly applications of K9 Advantix II flea and tick prevention for extra-large dogs weighing 55 pounds or more
  • FLEA, TICK AND MOSQUITO PROTECTION: K9 Advantix II flea and tick prevention for dogs works through contact, so fleas, ticks and mosquitoes do not have...
  • EASY TO APPLY: K9 Advantix II flea and tick control for dogs is an easy to apply topical formula
  • STARTS WORKING WITHIN 12 HOURS: Starts working to kill fleas within 12 hours and keeps working for 30 days
  • EFFECTIVE YEAR-ROUND: Suitable for effective year-round flea and tick treatment for extra-large dogs
SaleBestseller No. 18
BugMD Empty Refillable Spray Bottle 32 oz - for Use with BugMD Pest Control Essential Oil...
  • Versatile Use: The BPA-Free highly durable material makes this bottle a great companion for BugMD essential pest concentrate and BugMD Flea and Tick...
  • Built To Last: The BugMD Spray bottle is manufactured with high grade materials such as BPA-Free HDPE plastic and propylene, keeping the bottle...
  • Multi Spray Function: Our adjustable nozzle features 3 spray modes-lock, steady mist, and jet stream. From a fine spray to a targeted application, the...
  • Refill and Repeat!: This spray bottle also pairs perfectly with the BugMD Essential Concentrate (sold separately). Save money, stop throwing out...
Bestseller No. 19
TevraPet Activate II Flea and Tick Prevention for Dogs | Large 21-55 lbs | 8 Monthly Doses | Fast...
  • POWERFUL FLEA TREATMENT FOR DOGS: TevraPet Activate II provides flea and tick prevention for dogs that kills fleas, flea eggs, flea larvae, ticks,...
  • VET APPROVED, WATERPROOF FORMULA: Activate II uses Imidacloprid, Permethrin, and Pyriproxyfen - the same safe and effective active ingredients as...
  • FAST ACTING WITH NO BITING REQUIRED: Activate II REPELS and KILLS fleas and ticks on contact, without your furry friend needing to be exposed to...
  • BREAK THE FLEA LIFECYCLE: While other flea and tick repellents may only briefly suppress flea and ticks, Activate II for Dogs flea treatment stops and...
  • CONTINUOUS PROTECTION, MADE IN AMERICA: TevraPet Activate II is proudly made in the USA, and comes with eight (8) easy to apply monthly topical...
SaleBestseller No. 20
PetArmor Plus Flea and Tick Prevention for Dogs, Dog Flea and Tick Treatment, Waterproof Topical,...
  • EFFECTIVE, WATERPROOF FLEA TREATMENT FOR DOGS: PetArmor Plus is a waterproof, flea & tick topical prevention for dogs that kills fleas, flea eggs,...
  • TRUSTED, VET QUALITY FORMULA: Containing fipronil and (S)-methoprene, the same active ingredients as FRONTLINE Plus for Dogs. PetArmor Plus for Dogs...
  • BREAK THE FLEA CYCLE: Unlike other flea and tick treatments that may temporarily suppress flea activity, PETARMOR Plus Dog Flea Treatment works by...
  • FAST ACTNG LONG-LASTING FLEA AND TICK PROTECTION: One application of PetArmor Plus lasts up to 30 days nose to tail. A 6-dose package lasts up to six...
  • EASY-TO-USE, LONG-LASTING: PetArmor Plus flea and tick treatment comes with three (3) waterproof topical applications that provides your pet flea...

Having trouble finding a great Flea Liquid For Dogs?

This problem is well understood by us because we have gone through the entire Flea Liquid For Dogs research process ourselves, which is why we have put together a comprehensive list of the best Flea Liquid For Dogss available in the market today.

After hours of searching and using all the models on the market, we have found the best Flea Liquid For Dogs for 2023. See our ranking below!

How Do You Buy The Best Flea Liquid For Dogs?

Do you get stressed out thinking about shopping for a great Flea Liquid For Dogs? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching Flea Liquid For Dogs, which is why we have assembled a comprehensive list of the greatest Flea Liquid For Dogs available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Flea Liquid For Dogs that you consider buying. Your questions might include the following:

  • Is it worth buying an Flea Liquid For Dogs?
  • What benefits are there with buying an Flea Liquid For Dogs?
  • What factors deserve consideration when shopping for an effective Flea Liquid For Dogs?
  • Why is it crucial to invest in any Flea Liquid For Dogs, much less the best one?
  • Which Flea Liquid For Dogs are good in the current market?
  • Where can you find information like this about Flea Liquid For Dogs?

We’re convinced that you likely have far more questions than just these regarding Flea Liquid For Dogs, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for Flea Liquid For Dogs, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible Flea Liquid For Dogs. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an Flea Liquid For Dogs buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available Flea Liquid For Dogs currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of Flea Liquid For Dogs has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an Flea Liquid For Dogs?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your Flea Liquid For Dogs.
  5. Customer Ratings: Number ratings grade Flea Liquid For Dogs objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Flea Liquid For Dogs.
  7. Product Quality: You don’t always get what you pay for with an Flea Liquid For Dogs, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an Flea Liquid For Dogs is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining Flea Liquid For Dogs information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding Flea Liquid For Dogs is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

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FAQ:

Q: What is the best flea treatment for dogs?

A: Bayer K9 Advantix II. Bayer K9 Advantix II is a best bet for flea and tick medicine for dogs. … Frontline Plus Dog Flea and Tick Treatment. Another solid choice for topical flea and tick medication is Frontline Plus. … NexGard Chewables Flea&Tick Medicine. NexGard is the top rated prescription medication to kill and prevent fleas and ticks. … Capstar Oral Flea Treatment for Dogs and Cats. If you’re looking for a one-time use flea pill to end an existing infestation,take a look at Capstar. Bravecto Chews for Dogs. Bravecto is another prescription-only flea and tick prevention chewable. … PetArmor Plus Flea&Tick Prevention for Dogs. If you’re looking for the generic version of a name brand dog flea medicine,PetArmor Plus is the best bet. Bayer Seresto Flea and Tick Collar for Dogs. If you’d prefer the convenience and price of a flea collar,a top choice is the Bayer Seresto Flea and Tick …

Q: What are the best flea drops for dogs?

A: PetArmor for dogs is similar to most of the best flea drops for dogs, but it’s significantly cheaper. Its active ingredient is Fipronil , a broad-spectrum insecticide that is used in the control of fleas, ticks, and other insects. It is fast-acting and works within 24-48 hours after application.

Q: What is the best flea pill for dogs?

A: Bravecto Nexgard Comfortis Capstar

Q: What is the best flea killer for dogs?

A: Sentry Capguard Tablets has the same active ingredient as Capstar and the three other best flea pills for dogs we’ve named so far. Capguard interrupts flea infestation by killing adult fleas on your pet’s body. Pets must weigh at least 2 pounds and be at least 4 weeks old to be safely given this medication.