Exhibit 5.1

November 18th, 2016

SteadyMed Ltd.

5 Oppenheimer Street

Rehovot 76701

Israel

Ladies and Gentlemen:

We have acted as counsel to SteadyMed Ltd., a company organized under the laws of the State of Israel (the “Company”), in connection with the Registration Statement on Form S-3 (the “Registration Statement”), to be filed by the Company on or about the date hereof with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “Act”). The Registration Statement relates to the proposed offer and sale by the Company from time to time, as set forth in the prospectus contained in the Registration Statement (the “Prospectus”) and as shall be set forth in one or more supplements to the Prospectus (each, a “Prospectus Supplement”), of up to $75,000,000 aggregate amount of any or all of the following securities (the “Securities”): (i) ordinary shares of the Company, par value NIS 0.01 per share (“Ordinary Shares”); (ii) debt securities (“Debt Securities”); and (iii) warrants to purchase Debt Securities or Ordinary Shares (“Warrants”).

Each series of Debt Securities will be issued under an indenture, in the form filed as Exhibit 4.3 to the Registration Statement, as such indenture may be supplemented from time to time (the “Indenture”), between the Company and a trustee named in the applicable Prospectus Supplement (each, a “Trustee”). The Warrants may be issued under warrant agreements, in the forms filed as Exhibits 4.6 and 4.7 to the Registration Statement (each a “Warrant Agreement”), between the Company and a warrant agent (the “Warrant Agent”).

In connection herewith, we have examined and relied without investigation as to matters of fact upon the Registration Statement and the exhibits thereto, and such certificates, statements and results of inquiries of public officials and officers and representatives of the Company and originals or copies, certified or otherwise identified to our satisfaction, of such other documents, corporate records, certificates and instruments as we have deemed necessary or appropriate to enable us to render the opinions expressed herein. We have assumed the genuineness of all signatures on all documents examined by us, the legal competence and capacity of natural persons, the authenticity of documents submitted to us as originals, and the conformity with authentic original documents of all documents submitted to us as copies.

We also have assumed that: (1) at the time of execution, authentication, issuance and delivery of each series of Debt Securities, the related Indenture will be the valid and legally binding obligation of each of the Company and the applicable Trustee, enforceable against such party in accordance with its terms; and (2) at the time of execution, issuance and delivery of any Warrants, the related Warrant Agreement will be the valid and legally binding obligation of the Company and the Warrant Agent, enforceable against such party in accordance with its terms.

We have assumed further that: (1) at the time of execution, authentication, issuance and delivery of each series of Debt Securities, the related Indenture will have been duly authorized, executed and delivered by the Company and the applicable Trustee; (2) at the time of execution, issuance and delivery of any Warrants, the related Warrant Agreement will have been duly authorized, executed and delivered by the Company and the Warrant Agent;; and (3) at the time of issuance and sale of any of the Securities, the terms of the Securities, and their issuance and sale, will have been established so as not to violate any applicable law or result in a default under or breach of any agreement or instrument binding upon the Company and so as to comply with any requirement or restriction imposed by any court or governmental body having jurisdiction over the Company.

For the purpose of the opinions expressed below, we have assumed further that after the issuance of the Ordinary Shares pursuant to the Registration Statement, the total number of issued Ordinary Shares, together with the total number of Ordinary Shares reserved for issuance upon the exercise, exchange or conversion, as the case may be, of any exercisable, exchangeable or convertible security then outstanding, will not exceed the authorized share capital under the Company’s Amended and Restated Articles of Association.

Based upon the foregoing, in reliance thereon and subject to the assumptions, comments, qualifications, limitations and exceptions stated herein and the effectiveness of the Registration Statement under the Act, we are of the opinion that:

1. With respect to the Ordinary Shares, assuming the taking of all necessary corporate action to authorize and approve the issuance of any Ordinary Shares, the terms of the offering thereof and related matters, upon payment of the consideration therefor provided for in the applicable definitive purchase, underwriting or similar agreement approved by the board of directors and otherwise in accordance with the provisions of such agreement and the terms of any convertible Securities, if any, such Ordinary Shares will be validly issued, fully paid and non-assessable.

2. With respect to the Debt Securities, assuming the (a) taking of all necessary corporate action to authorize and approve the issuance and terms of any Debt Securities, the terms of the offering thereof and related matters (b) due execution of the trust agreement between the Company and the applicable Trustee and (c) due execution, authentication, issuance and delivery of such Debt Securities upon payment of the consideration therefor provided for in the applicable definitive purchase, underwriting or similar agreement approved by the board of directors and otherwise in accordance with the provisions of the applicable Indenture, such Debt Securities will constitute valid and legally binding obligations of the Company.

3. With respect to the Warrants, assuming the (a) taking of all necessary corporate action to authorize and approve the issuance and terms of any Warrants and the related Warrant Agreement, the terms of the offering thereof and related matters and (b) due execution, authentication, issuance and delivery of such Warrants and related Warrant Agreements upon payment of the consideration therefor provided for in the applicable definitive purchase, underwriting or similar agreement approved by the board of directors and otherwise in accordance with the provisions of the applicable Warrant Agreement, such Warrants will constitute valid and legally binding obligations of the Company.

In addition to the assumptions, comments, qualifications, limitations and exceptions set forth above, the opinions set forth herein are further limited by, subject to and based upon the following assumptions, comments, qualifications, limitations and exceptions:

(a)We are members of the Israel Bar and we express no opinion as to any matter relating to the laws of any jurisdiction other than the laws of the State of Israel and have not, for the purpose of giving this opinion, made any investigation of the laws of any other jurisdiction than the State of Israel. The opinions set forth herein are made as of the date hereof and are subject to, and may be limited by, future changes in the factual matters set forth herein, and we undertake no duty to advise you of the same. The opinions expressed herein are based upon the law in effect (and published or otherwise generally available) on the date hereof, and we assume no obligation to revise or supplement these opinions should such law be changed by legislative action, judicial decision or otherwise. In rendering our opinions, we have not considered, and hereby disclaim any opinion as to, the application or impact of any laws, cases, decisions, rules or regulations of any other jurisdiction, court or administrative agency. This opinion is expressly limited to the matters set forth above, and we render no opinion, whether by implication or otherwise, as to any other matters.

(b)Our opinions herein are subject to and may be limited by (i) applicable bankruptcy, insolvency, reorganization, receivership, moratorium and other similar laws affecting or relating to the rights and remedies of creditors generally including, without limitation,

laws relative to fraudulent conveyances, preference and equitable subordination, (ii) general principles or equity (regardless of whether considered in a proceeding in equity or at law), (iii) an implied covenant of good faith and fair dealing, (iv) requirements that a claim with respect to any Securities denominated other than in United States dollars (or a judgment denominated other than in United States dollars with respect to such a claim) be converted into United States dollars at a rate of exchange prevailing on a date determined pursuant to applicable law, and (v) governmental authority to limit, delay or prohibit the making of payments outside the United States or in foreign currency or composite currency.

(c)Our opinions are further subject to the effect of generally applicable rules of law arising from statutes, judicial and administrative decisions, and the rules and regulations of governmental authorities that: (i) limit or affect the enforcement of provisions of a contract that purport to require waiver of the obligations of good faith, fair dealing, diligence and reasonableness; (ii) limit the availability of a remedy under certain circumstances where another remedy has been elected; (iii) limit the enforceability of provisions releasing, exculpating or exempting a party from, or requiring indemnification of a party for, liability for its own action or inaction, to the extent the action or inaction involves negligence, recklessness, willful misconduct or unlawful conduct; (iv) may, where less than all of the contract may be unenforceable, limit the enforceability of the balance of the contract to circumstances in which the unenforceable portion is not an essential part of the agreed exchange; and (v) govern and afford judicial discretion regarding the determination of damages and entitlement to attorneys’ fees.

(d)We express no opinion as to the enforceability of any provision in any Warrant Agreement, Indenture or other agreement purporting or attempting to (i) confer exclusive jurisdiction and/or venue upon certain courts or otherwise waive the defenses of forum non convenient or improper venue, (ii) confer subject matter jurisdiction on a court not having independent grounds therefor, (iii) modify or waive the requirements for effective service of process for any action that may be brought, (iv) waive the right of the Company or any other person to a trial by jury, (v) provide that remedies are cumulative or that decisions by a party are conclusive, or (vi) modify or waive the rights to notice, legal defenses, statutes of limitations or other benefits that cannot be waived under applicable law.

(e)We express no opinion as to the enforceability of any rights to indemnification or contribution provided for in any Warrant Agreement, Indenture or other agreement which are in violation of public policy underlying any law, rule or regulation (including any federal or state securities law, rule or regulation) or the legality of such rights.

(f)You have informed us that you intend to issue the Securities from time to time on a delayed or continuous basis, and this opinion is limited to the laws, including the rules and regulations, as in effect on the date hereof.  We understand that prior to issuing any Securities you will afford us an opportunity to review the operative documents pursuant to which such Securities are to be issued (including the applicable prospectus supplement) and will file such supplement or amendment to this opinion (if any) as we may reasonably consider necessary or appropriate by reason of the terms of such Securities.

We hereby consent to the filing of this opinion as Exhibit 5.1 to the Registration Statement and to the use of our name under the caption “Legal Matters” in the Prospectus. We also consent to your filing copies of this opinion as an exhibit to the Registration Statement with agencies of such states as you deem necessary in the course of complying with the laws of such states regarding the offering and sale of the Securities. In giving such consent, we do not thereby concede that we are within the category of persons whose consent is required under Section 7 of the Act or the Rules and Regulations of the Commission thereunder.

Very truly yours,

Katzenell Dimant Law Office